When Craig goes up the stairs to confront Thor, he throws a set of bar bells down the stairs and roll toward the gym's back door, but in the next shot, they are right next to the stairs.
When Franklin discovers the first burglar on a ladder inside the gym, he knocks over the ladder and when it and the burglar crash through a wooden gate and hit the floor, you can see the burglar bounce twice. It is obvious there was a mattress positioned to cushion the fall.