The "Southern accents" by almost every character are wildly inconsistent from scene to scene and from each other.
After Brick and Big Daddy come up from the cellar, Big Mama says to Gooper, "Take these papers away before I tear them up. I don't know what's in them; I don't want to know what's in them." Big Daddy goes outside and talks to the folks fixing the light. As he approaches the door to come into the room where Gooper and Big Mama are arguing, the line "Take these papers away before I tear them up. I don't know what's in them; I don't want to know what's in them." is heard again.
When Maggie is arriving at the birthday party, she is assaulted by her niece who throws ice cream at Maggie's legs. Maggie scoops up a teaspoonful of the mess from her legs, with the intent of smearing it in the child's face. When she reaches the child, the tiny amount of ice cream she holds has grown to considerably more than a pint.
In the opening scene, Mae is shown rehearsing the children to play Dixie when they meet Big Daddy at the airport. Initially she is shown at the front of the parade, then in the next shot she is bringing up the rear.
The way Brick holds his glass changes, while Maggie talks with him about Gooper's plan to grab the estate.
Although it is filled once in the afternoon, the ice bucket in Brick's bedroom stays full well into the evening even though it's never replenished.
As the children rehearse and perform "Dixie" to honor Big Daddy, the little girl on the kazoo plays the instrument an octave lower than the trumpet. This would mean that a girl of 10 can sing in the bass-baritone range which is highly unlikely.
Brick's hurdle jumping technique is totally incorrect as any who was ever trained to run a hurdle race would know.
After Brick tries to drive away and gets stuck, Maggie goes out to him and helps him into the house through the pouring rain. Her hair is soaking wet, but the next time she is seen, it's perfectly dry and styled.
Despite the fact that merely stepping on his broken leg causes Brick to collapse, he is able to stand on both feet while he is smashing up the cellar. However, it's likely the extreme anger that Brick felt caused an adrenaline rush that masked his pain.
The enormous cake Big Mama brings into the bedroom - and continues to carry for the remainder of the scene - is clearly not real. Despite its size, she carries it with no effort and without it shifting on its platter. Later on, it is plain that the colored candles have nearly completely melted down, leaving streaks of wax all over the unchanged surface.
When Maggie is driving Big Daddy to the house, the needle on the speedometer never moves past zero.
When Big Daddy and Brick are talking in Brick and Maggie's bedroom about Brick's alcoholism, the audio on one of Big Daddy's lines is, "You'll hear plenty of that in the grave soon enough, but right now we're going to sit down and talk this over." The last three words in this sentence do not match the movement of Big Daddy's mouth.
When the doctor comes from the basement after seeing Big Daddy and approaches Big Mama, Mae and Gooper are having a conversation, but there is no sound heard. The audio is muted.
While Maggie is driving Big Daddy home from the airport, she tells him, "Why Brick loves you! Well he does!" After the shot changes during this, her mouth is not moving for the end of the line.
The children have a three-piece band: A kazoo, a big drum, and a bugle. However, the bugle is never heard when they play.
After Doctor Baugh tells Brick the truth about Big Daddy, he leaves from the balcony. However, near the last shot of the scene, a shadow of a person can be seen walking behind on the balcony long after Doctor Baugh left the scene.
In the opening scene, Brick is at a sports field bearing the sign "East Mississippi High School Athletic Stadium." Later in the film, after a storm, one of the characters states that the rain has "moved across the river to Arkansas." That implies that Big Daddy's plantation is somewhere close to the Mississippi River, which runs along the edge of western Mississippi. References to Gooper's law practice in Memphis and the 28,000 acres of rich land also indicate a plantation in the Mississippi Delta country, along the river in northwest Mississippi, rather than the eastern part of the state.
(at around 1h 21 mins) When the doctor leaves but before Gooper closes the door, a shadow of the boom mic appears on the wall to the right.
When Doc Baugh comes upstairs to tell Brick about Big Daddy's real condition, he examines Brick's leg and discusses football with him. In the course of that conversation, Brick alludes to a game played against "Bama State", meaning Alabama State. Bama State (Alabama State) is a historically black university in Montgomery. During the 1950s, Brick's college (presumably Ole Miss) would not have been allowed to play such a college.
[while adjusting her hose] Maggie asks Brick, "are my seams straight?" - though she's never seen in seamed-stockings (which were passé by the 1950s).
When Big Mama tells Gooper and his wife not to close the door, she begins to say, "there ain't going to be a word spoken in this house" and then flubs her line. She messes up the dialog by saying, "if Big Daddy falls asleep" but then she quickly catches herself and says the correct dialog, which is, "that he can't hear if he wants to".