Continuity mistake: In the scene where Griffin is marketing the yellow sports car to a customer in the dealership, he laughs out loud while fooling around in one shot, and as the camera changes, his face is straight, and when it changes to the previous camera, he is laughing and fooling around again.
Revealing mistake: When Gryffin first hears the animals talk to him, he runs home and at one point takes a bath. If you look at the bubbles, they move in a solid mass when he shifts around in the tub indicating they are not only fake but not real bubbles.
Continuity mistake: During the scene when they are trying to get a Red Bull can out of the Lion's throat, the saliva from the Lion is splattered on Griffin's forehead only, but as the camera cuts between angles, the saliva is splatter across his name badge and shirt, too. Change angle again, just the forehead, and back and forth during the whole scene.
Continuity mistake: When Gryffin is riding the little bike to get to the girl while being chased by the boyfriend, the flag on his bike changes colour between shots.
Continuity mistake: When Kevin James is biking with Gale, they get pushed into the main road. The same red minivan passes them 3 different times.
Answer: If you're talking about in the past, he actually didn't do anything. Shane was going to tease/hurt Bernie with the stick, but Bernie grabbed it. Shane then lied to the zoo about Bernie attacking him which led to Bernie being moved. Although prior to Griffin kicking Shane's ass, Shane ended up cutting Bernie in the face.
Bishop73