Look Who's Talking (1989) - 5 major mistakes

Factual error: When the view of the sperm going to the egg is shown, it is biologically wrong the way they show the sperm go inside the egg - only the head part of the sperm enters the egg, everything else stays on the outside and eventually dies off.

Continuity: When Molly takes Mikey to the Chubby Charles office to meet Albert, she changes his poopy diaper and slams it down on his new desk, rendering it junk. She then puts Mikey back on the floor, but never snaps the legs on his overalls. In the next shot, you see Mikey smashing Skeletor on the floor and his snaps are done, but when Molly picks him up to leave the office, they are undone again.

Continuity: When Mikey is talking about his diaper being wet in the crib there is a rattle to his right which appears and disappears throughout the scene.

Visible crew/equipment: In the scene where John Travolta is racing Kirstie Alley to the hospital, there is one shot where a camera rigging is clearly seen mounted on the hood of Travolta's taxi in the reflection of the storefront windows.

Revealing: When Molly's mother is listening (to what she thinks is sex) outside the apartment door, the handle is shown on the right side of the door. But anytime after that the door opens from the left side. Both doors open on the left. (For some reason Molly has 2 front doors to her apartment).