Revealing mistake: When the doctor probes the brain to move the leg up, a hand holding an object can be seen at the crotch, which is used to fake an erection next. (00:31:46)
Visible crew/equipment: After the little girl leaves the grocery store with Dodger, the monkey, the overhead microphone can be seen above her head.
Visible crew/equipment: During the performance of "Gotta Get A Gift", there is a handheld camera shot where the turtles are walking towards the camera singing the chorus while the camera moves around them. Just before the camera cuts to another shot, a stage light can be seen in the background to the left of shot, behind Michelangelo. Additionally, two shots after this, the same stage light can be seen again in the far background and can also be seen right at the start of the shot after that for a brief moment.
Continuity mistake: When Ernest is messing with the pipe in the locker room the toilet seat in the middle stall goes from being up to down and back up again.
Character mistake: When Frank says to "V" that his mother died before he was born, "V" replies that she doesn't think that's possible. She is wrong. Although it may be uncommon, some babies ARE successfully born even after the death of its mother (usually with an emergency procedure).