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: It wasn't that he was screaming out of fear of Ralph exactly, but more surprise to see Ralph of all people, as well as sudden fear of Ralph wrecking the party.
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