Continuity mistake: In the scene where Ralph smashes the cake, Mary is standing behind Gene. She's not holding anything during the smashing, but as Ralph begins to leave the party the camera shows Mary holding onto the cake figurines which would have been smashed previously. (00:13:40 - 00:14:15)
Continuity mistake: After Ralph destroys the cake and it goes all over the place, we cut to a wide shot. In this shot, to Gene's right, there is a small amount of cake on the floor. In the following shot, the amount of cake has doubled. Also after Ralph destroys the cake Mary is holding the people that were on top of the cake even though Ralph just destroyed them. (00:13:10)
Deliberate mistake: When Ralph and Vanellope are practicing driving, Vanellope loses one of her upper teeth. The tooth magically reappears again for the rest of the movie. (00:57:30 - 01:20:20)
Deliberate mistake: When Felix is about to receive his first medal, a few things change in a cut to a close-up. The building has grown much wider (32 notches under the roof compared to 22 before), giving the Nicelanders room to carry Ralph before throwing him, when previously Ralph was already against the edge. Additionally, a pair of large clouds has popped into the middle of the screen to cover the medal before it appears, which may have been considered too distracting to include in the previous shot. Later on, the medals which are engraved with Felix's name in-game instead bear a bas-relief hammer and gain a white stripe through the center of the ribbon when shown in 3D, a rather drastic change for what is only meant to be a view in greater detail. (Official recreations of the game work around the first issue by reducing the distances covered by objects on the roof to begin with.). (00:01:50)
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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