The character Long Duk Dong is referred to as a "Chinaman" throughout the film, yet has a Vietnamese name. To compound confusion, the incidental music and sound effects played for him are all Japanese or mock-Japanese music, including The Vapors' "Turning Japanese". In the tree scene, Dong is wearing his clothes and hair in traditional Japanese fashion while shouting "banzai" (a Japanese military expression). Whether or not these goofs were meant by the producers to be an intentionally ambiguous stereotype of Asians is unknown.
When the family is walking out of the church Sam can be seen walking out with them towards the back of the group, she quickly turns and runs back into the church presumably to get her sisters veil. The next shot Sam is back outside and this is when she states "her veil" then runs into the church again.
When Jake comes for Samantha at her house on the day of the wedding and Long Duk Dong answers the door, both panes of glass, from the inside, are clear, but when the door is opened, the panes appear frosted on the outside surfaces.
As The Geek enters the Rolls-Royce for the picture with Caroline, he opens the driver-side door and pushes the seat-back forward. In the next shot, the seat-back has already returned to position as The Geek flops into the rear seat.
When the grandparents are in Samantha's room sleeping and the phone wakes them up, the phone is in one position, Grandma hangs it up, and the receiver is different than before. Then when they answer it again it is in a different position. Then they have the phone on the bed.
When the family is leaving for the wedding, the grandparents all pile into the car, but it was not large enough to accommodate the group. Grandma Baker squats near the passenger door to create the impression that she is sitting in the car. However, when the car is backing out of the driveway, you briefly see her curved back remain stationary while the car moves away from her.
In the school auto shop when Farmer Ted tries to get into the car with Sam, he can't open the door because it is locked and Sam had to reach over to unlock the door for him. There is no door post for the lock to engage, so even if the door was locked, it would still swing freely.
In the opening sequence, a geek is having trouble opening the pad lock on his locker. When the locker is finally opened, some of the objects that fall out are obviously falling from overhead and not from the locker.