Continuity: When Kate hugs Mark at the train station, her sunglasses fall off the top of her head, but in the next shot her glasses are neatly back up on her head.
Continuity: When Kate returns home, Lorraine and the younger sisters goes out to greet her. Lorraine tells Kate about Charlie, she is wearing a beige outer clothing with her left hand clutching it. When they enter the house in the next shot, she is wearing pink.
Continuity: When Hank is falling into the pool of water he drops the apple, but in the next shot in still holding it.
Continuity: When Jake grabs a handful of meat from the kitchen he is wearing one shirt, but then is wearing a different one in the basement when the kids are soaking the underwear.
Revealing mistakes: When Tom is looking in the phone book for a babysitter, one of the close shots is flipped (reversed).
Continuity: After Tom decides to give-up coaching the Stallions, while he is walking on the field, we see his shoes next to a line on the grass. But then in the next shot, he is no where near the line at all.
Continuity: The egg on Tom's chin at the first breakfast disappears and reappears between shots.
Continuity: When Nora's boyfriend Hank struts into the Baker yard, we see him remove his left glove and arrogantly snap it. In the next shot, the glove is back on his left hand.
Continuity: As the kids are pulling the hose to trip Hank, right before he falls his hair and shirt are already wet from previous takes.
Continuity: When Nora is telling Hank that it would be fun to babysit, he throws down his pen and paper twice.
Continuity: Near the end of the movie, when Tom goes to Shake to resign, the football in the display case over his left shoulder moves from being at an angle to horizontal between shots.
Miscellaneous: When the neighbors come to their house, Jake throws one shoe at the dad and in the next shot we see that he has both shoes.
Continuity: When Charlie goes to look at his picture of Beth he drops his pen on a book on his bed, but when he puts the picture back, he picks up a pen from a book on his lap.
Errors in geography: Two times, when Tom Baker looks up at the Illinois Poly University scoreboard, there's a palm tree behind it.
Continuity: At the end when the family runs across the field to coach Baker, Charlie picks up one twin in each arm. In the next shot he picks up one twin again, but doesn't pick the other one up.
Continuity: When Mark runs into Tom as Mark is rushing to get water for his frog, Mark spills water all over Tom's pants; however, in the next shot, when Tom walks upstairs to talk to Nora, his pants are completely dry.
Continuity: When Dylan gets up after the chandelier crash, his parents begin to take off his helmet and safety pads; however, he is clearly rolled out the door still on skates and has an elbow pad on his right arm. In the next shot, we see the Shenks walking down the street, and neither the skates nor the pad are anywhere to be seen.
Continuity: When Kate drives away in the cab, you can see the Baker's purple turtle-top van parked a few houses down from their own.
Continuity: When Gunner is running under the table to get Hank, we see Henry and Jake' shoes, but in the next shot Henry and Jake are just coming in to sit down.
Continuity: When Kate tells Tom that Mark is gone, she isn't holding Mark's note. But in the next shot, she is.
Continuity: When Sara throws Mike's athletic cup, the spaghetti sauce makes a splash on the pot behind it, but in the next shot, there is no spaghetti sauce on the pot.
Continuity: When Kate is passing out toast, Kim catches a piece twice without having one on her plate the second time.
Continuity: Before the kids get into a fight at school, Mike knocks down one of the bully's lattes. The drink falls to the ground. In the next shot, Mike takes the bully down to the dirt and the latte isn't on the ground any more.
Continuity: When running down the field to greet the father, the relative positions of the family members is different in the overhead shot than either before or after.
Factual errors: When Tom Welling drives the red family wagon up to the house you see an Illinois license plate. On the plate all the numbers are together. Illinois plate numbers are separated.
Boom mic visible: In the original movie release, the boom mic is shown at least six times during the whole film. When it reached TV and video the errors were gone.
Continuity: When Tom is in the closet talking with Kate on the phone, the boys throw an ax into the door. At the end, there is no hole in the closet door.
Continuity: In the moving scene, the van has the parents, the dog, and 10 kids in it. The actual model of the van looks like it doesn't seat that many people.
Errors made by characters (possibly deliberate errors by the filmmakers): Kate's publishing friend is named Diane. But she is credited as "Diana Philips".
Errors made by characters (possibly deliberate errors by the filmmakers): The dad requests a babysitter for twelve children, although four of his kids are much too old to need a babysitter.
Continuity: When Mark runs away and Tom goes to the train station, the train says 1) Coach and 2) Amtrak. When they pan over the train, the train shown is a commuter Metra train, not an Amtrak.
Revealing mistakes: When Dylan is taken to the hospital after the birthday incident, he has a black eye and a broken arm. When Kate asks his parents if they have seen mark after he ran away, there is no trace of the black eye or the broken arm. Broken arms usually take a couple of months to heal in a cast.
Revealing mistakes: When Kate opens the closet doors, she flinches before the toys fall on her.
Revealing mistakes: When Tom first brings the team home to meet his kids, there are 2 different players wearing #62.
Continuity: The first time the team meets Tom's kids, there are 2 different players wearing #62 and both are black. Moments later, when the team is outside practicing, you again see a player wearing #62 but now it's a white guy.
Errors made by characters (possibly deliberate errors by the filmmakers): For some reason Sarah and Henry are never shown going to school even though there are scenes with the twins, Jake, Mark, and Mike going to the elementary school/junior high, and Charlie and Lorraine going to high school.