In several shots throughout the film you can see the arm, and even body, of Charan Prabhakar, the actor who plays DinoHand.
At the end of the bounce house fight scene the establishment was closing for the night while the crew was still trying to get one last shot. They turned the lights off on the actors, which is why the shot of Cletus kidnapping DinoHand is filmed using "night-vision" mode.
In several shots of Spencer "picking up" DinoHand he's clearly picking up nothing at all.
As Spencer is wiping away tears during his farewell with DinoHand, you can clearly hear Charan, who was operating the camera, direct "show more emotion."
Several times the "T-rex footstep noise" is missing when it's clearly meant to line up with the visual of the camera shaking as DinoHand approaches.