Other mistake: When Ralph smashes the giant cake, pink icing splatters the walls, the floor and the other video game characters. There are no pieces of the actual cake anywhere, only the icing.
Other mistake: When Ralph "checks in" at the Game Central Station after the villains meeting, he jokingly gives his name as Lara Croft. Lara Croft was never an arcade game character, so how would Ralph know about her?
Answer: When Ralph and the other bad guys enter Game central station. The camera pans out, to the lower left corner there is Maximus and in the upper left corner you can see the dinosaur. If you still can't see it, there is an intermission mode on the DVD that will allow Chris Hardwicke to explain this and other interesting things about the movie.
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