When we first see the Sarlacc there is this weird looking crab claw thing flopped over to one side.
I think it's meant to be part of the creature but it's never been animated not even in any of the SEs.
Just now I thought rather than just animating it there might be more tension to be had by making it a snapped off limb of a former meal still flapping around.
When Luke looks down at the pit we could see some tentacles dragging the left overs into the mouth giving the audience a taste of the threat the pit creature represents.