Visible crew/equipment: During the scene when Jackie shows up at Samuel's place, Samuel and Jackie walk out the glass door, while Robert De Niro stays inside. When Samuel is done arguing with Jackie, he opens the glass door. If you use slow motion, you can see a crew member/camera man standing there. [Slow motion is permitted for significant mistakes like a crew member in shot.]
Visible crew/equipment: In the scene towards the end of the movie when Louis is explaining to Ordell what happened to Melanie, they are riding in a van. Several times during this scene, if you look out Ordell's window, you can see the trailer that the van is riding on (as well as the lighting/camera equipment used) in the reflection of many of the storefront windows.