During the big concert, when the camera cuts to views from the audience several times quickly, the claps are not cued correctly in some of the shots, so that the people are clapping on the downbeat and the sound of the claps comes on the off-beat.
About 35 minutes into the movie, Elwood plays a Decca 78 rpm record of Louis Jordan. However, the record is spinning on the turntable at 45 rpm. The turntable used is a more modern model which may not have had 78 rpm.
When the band is playing in Ray's Music Exchange, and also at big gig at the end, we can clearly hear the drums and cymbals crashing, but the drummer is faking his movements; the cymbals do not move, nor does the drummer actually make contact with the drums with his drumsticks.
The music played in the church does not coincide with the musician's movements, especially the drummer; the soundtrack plays the snare drum while the depicted drummer is on the upbeat, and not the downbeat.
After playing the "Rawhide" theme, Elwood refers to it as "...an old Rowdy Yates tune...". Rowdy Yates was a character played by Clint Eastwood on the show. The theme on the "Rawhide" TV show was written in 1958 by Dimitri Tiomkin, written by Ned Washington (lyrics), originally recorded by Frankie Laine. The song was used as the theme to the television series that ran on CBS from 1959 to 1966.
A man asks Elwood if he got him his Cheez Whiz, and he throws him a spray can of cheese. Cheez Whiz is a cheese sauce product that comes in a jar or a squeeze bottle. The canned spray cheese is actually called Easy Cheese.
During Aretha Franklin's "Think" number, the backup singer in the postal uniform continues to lip-sync the word "Freedom", when that part of the backup vocal is over, and makes an obvious mid-word stop upon realizing her mistake.
At the end of the movie, when the band members are being identified, and each of them plays a lick on his instrument, Tom Bones Malone plays his trombone left handed (the slide has been twisted to the left side of the bell; the right side it normal).
The two soldiers that open fire on the door use original M16s in every other scene, but when they shot the door, their rifles switch to Colt SP1 M16, most noticeable by the lack of a forward assist on an SP1.
While in the shopping centre, the outside of the overturned police car during shots of the interior of the car suggests that the car was flat on its roof. However the exterior shots of the car show the car on an angle.
In the middle of the Triple Rock Church scene, Elwood and Jake "get religion" and start to dance at the back of the church. When they cut away to a high shot that shows the entire congregation, you can clearly see Elwood and Jake at the back of the church just standing there. When they return the shot to the two of them, they are dancing wildly again.
At different points in the movie, Mr. Fabulous' hair alternates between being slicked back and dry and curly. Such instances are when the band stops at the Howard Johnson so Jake and Elwood can make a phone call, at Bob's Country Bunker, and at the final concert.
When Jake is closing the set at Bob's Country Bunker ("You don't have to go home but you can't say here"), bottles are still flying at the chicken wire. When the camera cuts to a long shot, there are no patrons left in the bar.
When Elwood goes into his boss' office to quit his job, he drops his briefcase almost in the center of floor outside the office. When he leaves the office and opens the door, the briefcase is no longer in the center and has moved to the left.
When James Brown is singing, he clearly has the microphone in his hand as he sings to the right-hand side of the congregation, yet in the next shot, he is seen taking the mike out of the mike stand in the pulpit.
After the Illinois Nazi's Pinto crashes through the street, Elwood guns the engine and the Bluesmobile leaps over the hole. On the landing, the Bluesmobile's right tail light is out, but when we see the car again, just before it falls apart, both tail lights are working.
After the scene in the Country Bunker, the Bluesmobile's back windshield is shot out. It stays missing until the car is entering lower Wacker drive. As the car descends the ramp, lights can be seen reflecting off the rear windshield, but later in the chase, it's gone again.
During the performance of Rawhide, a long shot shows Jake walking over and taking the whip off the wall. Two camera cuts later, there is the closeup shot of Jake noticing the whip on the wall and starting over to pick it up.
When being chased by the Illinois Nazis, the Bluesmobile comes to a halt and just misses falling over the edge of an incomplete bridge. Elwood then throws the car into reverse and the force of the car's acceleration causes it to flip on its own rear-bumper and leap over the pursuing car. However, the way the car is shown rotating in mid-air (edge over edge), it should have landed still pointing in the same direction it was traveling before the flip. Instead, the car lands pointed in the opposite direction.
In Elwood's speech just before leaving the final show, he says it is 106 miles to Chicago and it is dark (nighttime). Yet in the next shot, he and Jake are being pursued in the daytime. Unless they traveled at a very low rate of speed, left just before dawn or took some detours, they should have reached Chicago while it was still dark.
In the scene at the county assessor's office, when Jake and Elwood run up to the inner door and see the "back in 5 minutes sign" you can clearly see that the door is unlocked and still is when the clerk comes to the door.
Before the big concert, Jake swings the key to the handcuff/briefcase in his right hand. When entering the stage it is still swinging in his right hand. When the camera cuts, we see the key swinging in his left hand.
When Jake collects his personal effects on leaving prison, he is issued with his black suit jacket, trousers, shoes, hat, sunglasses. Yet he is seen leaving prison also wearing a white shirt and black tie.
During the scene of the Nazi's Pinto sailing off the overpass, the "White Power" Bumper sticker visible on the car's rear window during exterior shots disappears during interior shots looking out the station wagon's rear window.
When the troopers pull out from behind the billboard, they run into the Good Old Boys. The first shot shows the truck driven to the side of the road and the cop car clips the back corner of the truck. In the next shot, the cars are very far apart and flip over identically.
After the Bluesmobile lands on the other side of the drawbridge, the front license plate is crumpled and hanging off the bumper and even the Pitt bumper is bent. But, when we see the car again, the license plate and the Pitt bumper are back in place.
When the Blues Brothers get pulled over by Troopers Daniel and Mount, they pull up in front of a house with a dark Camaro and a light colored sedan. But in the shot of Mount getting back into the cruiser after the Bluesmobile speeds away, they are in front of a house with a nice lawn and no cars in front.
During the police chase in the mall parking lot, the headlights on the Bluesmobile are on. But during the Bluesmobile's collision with the Oldmobile dealership, the headlights are turned off. They are back on again as the Bluesmobile exits the mall.
As one of the trains passes Elwood's place, the triangular yellow "No Passing Zone" sign above the refrigerator falls slightly and swings left a bit. Then, in the close-up of Elwood making toast, the edge the sign can be seen down behind the fridge. When the shot pulls out again, the sign is where it originally fell to.
During the gas station explosion, the wide shot that includes the tanker truck shows the Bluesmobile to be nowhere in sight. But in the next shot from inside the car, the Bluesmobile is just passing the tanker truck.
After the Bluesmobile comes to a stop on the edge of the unfinished overpass, Elwood guns the car in reverse. The close-up shot shows the front wheels climbing back up on the freeway. Then, in the next wide shot, the wheels climb up again.
During the chase from Lake Wassapamani to Chicago, Elwood tells Jake he has to pull over, then leaves the highway, drives across a field and gets onto an onramp. A few seconds later, the IHP cars crash in the same field; numerous shots showing the same onramp show that the Bluesmobile has vanished.
At the end of the chase from Lake Wassapamani to Chicago, Elwood crashes through a number of wooden barriers in the police roadblock. When he enters Chicago, a few shots show the Bluesmobile's windshield shattered, but it goes back to being flawless until the end of the chase.
At the Palace Hotel concert, a woman extra in the crowd wearing a white blouse and yellow pants is seen at the front of the audience and to the left of the catwalk. In one shot she is seen to the right of the catwalk. And then for all subsequent shots, she is back at the left of the catwalk.
When Elwood causes the major pileup of police cars under the El (starting at 1:54:09) there is a small group of people on the left in front of a discount record store. This group of people disappears and reappears several times in subsequent shots.
Before the bridge jump, the Bluesmobile has the middle piece of trim, reading "DODGE", between the taillights. After the jump, it's gone. On Maxwell Street, it reappears, this time missing the middle D.
During the chase from Lake Wassapamani to Chicago, IHP patrol car #55 looses control, goes airborne and then crashes into the trailer of a large truck. The sky at this time is totally cloudy. When Mercer finishes talking on the police radio, the sky is now almost totally clear with either a rising or setting sun in the background.
After Reverend Cleophus James's "sermon" he puts the microphone back into its holder and says, "There you go." Cut to a shot of him behind waving at the congregation, and he is still holding the microphone.
After James Brown's 'sermon' he is shown putting the microphone back into it's holder and saying "There you go". Cut to a shot of him behind waving at the congregation, and he is still holding the microphone.
In the final chase with the Illinois Nazis, the Blues-Mobile is flipped upside down. A piece of equipment (evidently to push up the front of the car) can be seen rising from the street and flipping hood of the car backwards.
When Elwood begins driving to run the Illinois Nazis off the bridge, the Bluesmobile is being filmed from the outside. As the back window (directly behind Jake) passes the camera, you can see a reflection of the cameraman (he wears glasses).
When returning to Chicago from Wisconsin, Jake and Elwood approach the city from the south, entering Lake Shore Drive from McCormick Place, when in reality, they should have approached the city from the north, as the police officer had stated earlier that the brothers were southbound. Jake and Elwood ultimately would have had to drive through the city to reach that location, short of driving west by dozens of miles to bypass it.
During the final chase scene, state troopers indicate that Elwood and Jake are heading into Illinois on "highway 47" toward Chicago, which is shown to be a four-lane highway. Illinois 47 is a two-lane highway which ends at least 25 miles south of the Wisconsin state line.
In the first car chase, it is said Jake and Elwood are traveling southbound on IL 47, but the highway looks more like 1-90 because it is a divided highway and there is a frontage road (when Elwood says "Jake, I have to pull over!").
Ray's Music Exchange is clearly located in the city of Chicago, with an elevated train platform in the street during the "Shake a Tail Feather" dance number (the location is actually Shelly's Loan and Jewelry at 300 E. 47th St.). Yet the Brothers ask the Clarion Records president to pay part of their advance to "Ray's Music Exchange in Calumet City," which has no el service.
When being chased by the Illinois Nazis, the Bluesmobile comes to a halt and just misses falling over the edge of an incomplete bridge. You are lead to believe this is in Chicago but the scene was actually shot in Milwaukee. The building in the background is US Bank in Milwaukee.
When the brothers come from the stairwell onto the Assessor's office floor, they barricade the heavy fire door from the office side (which makes for a good forced entry by the cops) but fire doors have to open toward the stairwell to prevent people from being trapped against it. (One might argue that the municipal building predated the fire codes...but it is an upgraded steel fire door.)
Close to the end of the final car chase, a brief shot of the Bluesmobile's speedometer also shows the fuel gauge reading nearly full. Since the Bluesmobile has been driving at high speed for at least 106 miles the gauge should be considerably lower.
When Jake and Elwood are at the Chez Shea restaurant talking with "Mr. Fabulous" (Alan Rubin), Jake tells Alan if he doesn't join the band that Jake and Elwood would eat at the restaurant for "breakfast, lunch and dinner every day of the week". The Chez Shea is a top-end restaurant, not a family restaurant, and is never open for breakfast, serving lunch and dinner only Monday through Friday, with one dinner service on Saturday. They are closed on Sundays.
When the Brothers ask where the tax assessor's office is, they're told by the desk officer to go to the end of the hall, turn right, and take the elevator to the eleventh floor. When the police officer asks if the Brothers have come in, all the desk officer says is he sent them to the end of the hall without saying what floor. Yet all of the officers and soldiers end up going to the eleventh floor anyway.
Lake Wasapamanni is 106 miles north of Chicago, placing it in Wisconsin, yet Illinois state troopers show up. But considering the attitude of the Illinois police in the film to personal rights ("Use of unnecessary violence in the apprehension of The Blues Brothers has been approved"), they wouldn't be likely to care about jurisdiction either. Later, the Illinois State Police follow them to Kokomo, Indiana, for the same reason.
The PA speaker the Blues Brothers use for announcing their concert is shown to be an outdoor warning siren taken from a children's play area. While these air powered sirens are typically not capable of audio reproduction, the companion book that came out with the movie explains that Donald "Duck" Dunn rewired the siren so that it would work as a P.A.
When the Blues Brothers visit Sister Mary Stigmata (a.k.a. The Penguin) the actress, Kathleen Freeman, is wearing a ring. Many orders of religious sisters wear gold bands. The band signifies their "betrothal to their Heavenly Spouse".
During the "Stand by your Man" song, drummer Willie uses a metallic brush stick and a normal stick. At the end of the song, the brush stick disappears and Willie is shown using two regular drum sticks. However, he may have switched off camera at some point.
In the convent when Jake and Elwood visited the "Penguin" nun, she is wearing a wedding ring. However, in many Catholic female religious orders, a ring is worn to show that the sister is a "bride of Christ". Further, she is a "sister", not a "nun", as she is not in a nunnery.
During the song "Rawhide" at Bob's Country Bunker, Jake cracks a whip several times, once snapping a waitress' cigarette out of her mouth. But the bandstand is completely surrounded by chicken wire, so this would be impossible.
When the Blues Brothers drive through the grocery store, customers and employees are seen running towards the camera, turning left (their right) off camera to avoid the oncoming car. The last person - an employee - actually bumps into the camera before turning, jarring the camera.
After Mystery Woman bombs the transients' hotel, Jake and Elwood emerge from rubble made of obvious fake "stage bricks". Stage bricks are brick-colored lightweight-material safety blocks used to reduce injury to actors during destructive special effects shots. Despite their convincing coloration, stage bricks are readily noticeable because (unlike real structural brick debris) they are almost always "clean" : no visible traces of mortar-cement on them.
The Good Ol' Boys are in a pickup with a camper topper that's hit by a police car and both vehicles roll over. A short length of pole called a kicker is fired out a tube through the floorboard to flip over a vehicle. The smoke from the charge that fired the police car's kicker is visible throughout the overhead shot. The kicker itself can be seen rolling across the road and bouncing off the curb (watch the curb at screen top center). Once the bottom of the pickup is in view, its kicker tube is obvious behind the passenger-side front wheel well.
Prior to colliding with The Good Ol' Boys' RV, the two state troopers are shown parked behind a ground-level billboard. They then spot "... that shitbox Dodge again", and gear up for the chase. However, when the switch is made to the external shot, the troopers' car can clearly be seen moving at full speed from a place somewhere to the right of the billboard and passing behind it, at which point the crash with the RV occurs.
When the police officers are emerging from the debris of the building that Mystery Woman blew up, a brick sits on the brim of one officer's hat without bending the hat or causing the officer to tilt his head under the weight, signifying that it is not a real brick.
When Mystery Woman handles a model airplane radio control transmitter when she prepares it for the remote control exploding of the hotel, the power switch in the transmitter is off. Also, she moves the left control stick with no purpose at all.
For the first few frames of the scene where the Pinto crashes through the street, the car can be seen held in its pre-drop position, reflected in the upper window of one of the buildings. After it is released, a guide or safety cable can be seen extending from the rear bumper to the left of the frame. As it impacts the street, all the buildings shake, indicating that they're just scenery flats. Finally, the breakaway section of the street can be seen in outline before the car hits.
At the beginning of the big chase scene, just after the Good Ole Boys' driver says he has a problem, you see his view as they weave through the surrounding cop cars. A Winnebago could not possibly weave through cars that close at that speed without hitting any of them.
During the chase in the mall parking lot, one shot from inside the Bluesmobile (looking toward Jake's side) shows a pedestrian calmly walking right next to the car, revealing the stock footage on the blue screen exterior.
When the police catch up to Elwood and Jake at Daley Plaza, at least one tank, an M4A4 Sherman, shows up, likely of the Illinois Army National Guard. While state militias did not get the newest equipment (the Ohio Army National Guard was still using M1 Garands in 1970, and as late as 2000 the Kentucky Army National Guard was still issuing M3 Grease Guns to tank crews), the Illinois National Guard would not be so badly out of date that it was still using Shermans in 1979, as the last North American unit to use M4 Shermans was the Ontario Regiment, RCAC, in 1971. By 1979, regular units were armed with M60A3 tanks, with reserve units such as the Illinois State Army National Guard using M48A5 Pattons.