Revealing mistake: Intro Mission 5: In the cinema cut scene after the mission, Reed and Victor being talking. Reed's eyes are not looking at Victor, but to the left of him.
Revealing mistake: Intro Mission 4: If you get Sue next to a wall and move the camera around so it forces a close up, you can see Sue's hair is incomplete. Especially towards the back, there being gaps in the texture showing empty space. This is fixed in later levels after her character model changes to her in her Fantastic 4 suit.
Revealing mistake: Intro Mission 2: Lots of the destructible objects in the hospital can be broken simply by just jumping on them. Some of these objects are large plant pots with a small green tree in them. When you jump at them, the foot only has to just touch a leaf of the plant, and it causes the whole vase to shatter.