Continuity mistake: Susan's bang is significantly above her eyebrows when she watches the parade at Bryan's house. That same evening during Thanksgiving dinner, it touches her eyebrows.
Continuity mistake: When Holly is meeting Ben for the first time and Holly's friend says, "Sounds like she's not into romance," Holly is eating a spoon of ice cream in the shot from the front. However, in the shot from the back, Holly's hands are on the table.
Continuity mistake: When Carolyn first enters David's room at NASA headquarters, she introduces R.A.L.F. Between shots, David wraps both arms around his knees. (00:30:35)
Continuity mistake: After Danny gets mad at Walter for catching the ball that his Dad threw for him, he throws his glove down on the floor and runs inside. In the next shot the glove is in a different location.
Continuity mistake: When Alice leaves to think over Hamish's proposal and chases after the White Rabbit, the heels on her shoes change, but when she falls into the hole the heels are back once again.
Continuity mistake: John Heard's racquet jumps from one hand to the other when he and Tom Hanks fight on the tennis court. (01:17:20)
Continuity mistake: When Rosie hands Benjamin the listing for the Rosemoor property, the house in the listing's photo is not the house on the property, it's entirely different.
Continuity mistake: As Lulu is racing up to the school, you see the brick base of the school house and that the bricks are a dark red color. It then cuts to a closer angle as she is about to pull her fishing pole out of the steps and suddenly the bricks are now a light grey. Also in the same shots, you see first that the tree's shadow is lay across the walkway in front of the steps. But in the close up the shadow is nowhere to be seen. (00:01:55)
Continuity mistake: In the parking lot scene we see Tommy get thrown through what appears to be plasterboard. When he goes through it leaves a big chunk still attached in a triangle shape. Camera cuts and what remains has changed and the triangle piece is not to be seen. (00:23:10)
Continuity mistake: After Fifi sings her line of the opening song, a stack of textbooks on Bugs Bunny's desktop changes appearance between shots. (00:01:45)
Other mistake: When Gomez begins to flip through his desk calendar, we see that "today" is Thursday, March 28, 1991. He then turns to the date of the "next quarter". The left hand page shows Thursday, August 8, but the right hand page shows Tuesday, September 9. (00:11:15)
Continuity mistake: When McLeach is using Cody to fish for crocodiles, the hook fastened to the rope around Cody's waist can be seen facing different directions in various shots. (01:06:45 - 01:09:35)
Continuity mistake: When Godfather Drosselmeier walks into Marie's bedroom before he tells her the story, the bedroom door opens from the left, but after Marie's mother brings her the breakfast tray the door now opens the opposite way, from the right.
Continuity mistake: The buttons on Amos Slade's shirt repeatedly change sides between shots throughout the movie. One example is while Copper and Tod are swimming, when Amos tells Chief that Copper has strayed off again, the buttons on Slade's shirt go from being on the left to being on the right, then back to the left again. (00:21:50)
Revealing mistake: After Chuck steps on the toy duck, he looks up to see the alien family and their house behind them. However, there is no reflection of this on his visor, just an empty field and the trees beyond.
Continuity mistake: The way Tess holds the notepad, to show grandpa the message, changes between the shots. (00:11:30)
Visible crew/equipment: When Christy and Alan take off on the scooter, we see a few instances of Kirsten Dunst and Gregory Smith's stunt doubles. (01:15:43)
Continuity mistake: The letters A and B on the bottom row on the blackboard differ styles between shots, being wobblier in the second shot.
Continuity mistake: While at Dino Stop, Katie convinces her dad not to play it safe and to take a chance to save the world. Rick agrees and extends his left hand for the "all hands, Mitchell family on three." In the closeup we see Katie put in her right hand, but in the wide shot Katie's left hand pulls out. Also, note that in the closeup both Katie's and Aaron's positions between their parents are switched. (00:45:00)
Other mistake: In the FTI records room, when Arnold and Gerald open safe deposit box 999, the box is quite empty with a mirrored surface, and we can see the reflection of Scheck appearing behind them. The problem is Scheck's reflection is not backwards. (00:50:50)