In the beginning when the truck is driving down the road, it is clearly not a refrigerated truck. When the truck is up close, the refrigeration unit is visible.
When Silva breaks the head of the mannequin his companion says it is solid plaster. After he hits it, it breaks up into may small pieces leaving the face intact. if it were solid plaster it would not break in such a manner or even break at all. It is obviously hollow and filled with small pieces of broken plaster.
Obvious stunt double for Steve Silva during his face off with Li Sung.
Although Tom Holland's character is named Steve Silva, the name is erroneously listed in the end credits as "Frank Silva."
In the opening scene David is hitchhiking in a torrential downpour. When the closeup of his face is shown, it's completely dry except for a drop or two of water.
After the Hulk rescues the old man from the truck and carries him into the woods, large portions of the green makeup are rubbed off of the Hulk's right shoulder and wrist. The makeup is visible on the old mans shirt.