Other mistake: Bruce is seen wearing a Polar F5 heart rate monitor in a couple of scenes after Betty gives it to him (such as when he is in bed with Betty) but there is no transmitter strap around his chest, which that model needs in order to pick up the wearer's heart rate.
Other mistake: When Bruce is riding his bicycle to deliver pizza to the University, you hear him ringing a bicycle bell while he says, "Excuse me". If you look at the bike he's riding, there's no bell to be found. (00:36:00)
Other mistake: In the University battle sequence, the screen shot of the attacking helicopter's targeting system indicates a lock on the Hulk, but when the pilot opens fire, the machine gun bullets "walk" to their target, instead of being direct hits as would be expected.
Answer: Yes. In the alternate opening, after Bruce turns into the Hulk and causes the ice to collapse, a huge chunk of ice is broken free from the ground. In this ice is a figure dressed in blue holding a round shield with circular red and white stripes. The best way to see this is waiting until the huge ice wall breaks and then slowly advance frame-by-frame and eventually Captain America and his shield will be seen.