Other mistake: Right at the beginning of the movie, when Lewis's real mum picks him up from the box and hugs him, it's no more than three seconds before she hears Lewis from the future slipping on the step. She gets scared and puts baby Lewis back in the box. When Wilbur takes Lewis to meet his mum, near the end of the movie, the time his mum holds the baby is more than twenty five seconds.
Other mistake: In the beginning, when Goob falls asleep, he misses the catch, by almost a foot or so. At the end of the movie when Lewis calls out to Goob, the ball lands on his head, and drops into his hand. Since Lewis didn't alter the timeline to where Goob is standing, (as to the part of not inventing the helping hat) Goop should have been in the same spot.
Other mistake: In the beginning of the film when Lewis is dropped off at the orphanage there is a blue car parked in the background. This is the same exact car (license plate and all) that he is driven away in when adopted at the end.
Suggested correction: There are 3 options: First, it may be a car that hasn't been sold to their future owners (Bud and Lucille) since it was still in the past anyway. Second, if it is proven to be Bud and Lucille's during this time, it could still make sense, as we could see in the ending when Lewis tests his memory scanner that Mildred (or the orphanage lady) was present in their wedding. Third, it's also possible that it's just the default model for the car and we weren't supposed to see it.
