Continuity mistake: When Dr. Ross empties her handbag on the bed, there is a Givenchy compact with the Givenchy insignia face up. When the bed is shown again, the compact is face down.
Factual error: When Blonsky is seen wearing the American Class A uniform, it's visible he has not shaved his face for days. Quite unthinkable for the military - be it American or British. If he had time to change from his BDUs to the Class A uniform then he would have had time to shave as well. Soldiers in Iraq aren't even excused from shaving daily unless they have a medical condition that prevents them from shaving.
Revealing mistake: In the scene where Bruce is in the helicopter hearing about the other "hulk", the camera is the only thing being moved around to simulate a shaky helicopter ride. The equipment nor any of the actors inside the copter are moving around or stabilizing themselves according to how bumpy the camera movements are making it out to be.
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)
Factual error: When Bruce and Betty are attempting to drive into New York, they get stopped at a police roadblock at the tunnel entrance and start walking instead. When we see them crossing a bridge, a sign says "No Wake - Speed Limit 9km\H. Being in the United States, this would be miles per hour or knots, not kilometers. (01:11:50)
Audio problem: When the general asks how Blonsky was doing, he doesn't open his mouth. (01:07:40)
Continuity mistake: At the university while Hulk fights the army the sun changes between shots.
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.
Continuity mistake: When Abomination pins Hulk to the wall, and Hulk starts to push back, at first, when the camera view is level with their heads, Abomination's left hand is grabbing Hulk's right forearm. But when the camera view lowers to their abdominals, Hulk's right hand is grabbing Abomination's left forearm.
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.