Continuity mistake: After the birthday party, Clown puts down a drink and some snacks on a garbage can and rips off his clown outfit. When he puts the drink down, it falls over. However, just a few shots later, suddenly it's standing back up again. (He never picked it back up between the shots).
Deliberate mistake: When Violator turns back into Clown in the alley, watch closely. You can see his shadow beneath him for a few seconds as he's transforming, and it doesn't match the transformation of the giant monster into the Clown... it's just Clown's regular shadow from the actor standing on-set. More than likely, it's a shortcut for the effects - they didn't bother rendering a simulated shadow. You have to look kinda close to notice it the first time, but once you see it, it's obvious.
Continuity mistake: When Spawn is fighting Violator for the first time, there are some shots of him walking down the alley looking for Violator while holding his gun. In-between shots, Spawn goes from holding his gun with one hand, to both hands, back to one hand, etc. repeatedly.
Continuity mistake: When Spawn is fighting Violator the first time, there's a moment where a homeless man finds Spawn's gun, and Spawn grabs it and spins around to point it at Violator... only to realise Violator has vanished. In the first shot of Spawn grabbing his gun, he's right next to the homeless man, and the homeless man begins to turn his head in Violator's direction. It then cuts to a wider shot, and suddenly Spawn is a bit further away from the homeless man and the man is no longer turning his head.
Other mistake: Towards the beginning when someone is looking at a newspaper about the airliner being blown up, there are nonsense articles on the paper and pictures of people that don't match the names under them. With some white guy's picture over the name Michael Jordan on the left of the page, and then on the right a picture of a white woman with the name Will Smith under it.
Deliberate mistake: The legion of hellspawns during the film's climax are merely copied and pasted throughout the screen, as evidenced by the fact that many of them perform the exact same distinguishable body movements, such as pacing right and left from a crouched position.
Chosen answer: He is squatting the entire time in every scene. The suit probably helped in ways to balance himself whilst squatting, so he could hold on much longer than normally.
lionhead