The lighting works, the performance lands, and an extra prop appears by the wall. If the background is visible elsewhere in the shot, After Effects can use nearby frames to fill the area you mask. That makes a small continuity repair possible while keeping the timing and framing you already like.
Make the area around the object transparent
Draw a mask close to the object and set its mode to Subtract. The mask cuts a transparent region out of the layer. If the object changes position, adjust the mask over time. Rotoscoping means following the outline of a moving element across frames. Adobe lists masks and Roto Brush among the ways to create the transparency the fill tool needs.
Give the fill usable background detail
In the Content-Aware Fill panel, choose Object for a moving object, select the time range and run Generate Fill Layer. After Effects uses the current and neighbouring frames to build a layer that fills the transparent region. If the prop casts a broad shadow, try handling it separately. Moving water or shifting light can make the patch harder to match. For a difficult repair, Adobe recommends guiding the fill with a reference frame cleaned up in Photoshop.
Watch how the repair moves
I’d look behind the object before choosing this technique. If you see the wall after the prop moves away, there’s real picture information for the fill to work with. If the prop covers a moving arm throughout the shot, the patch can break its outline and call for more careful masking. Play the result at normal speed, then revisit the frames where the object appears and disappears. Look for flicker along the mask, a shadow that jumps or a patch that catches the light differently.
