Easter egg = inside joke, that fans are intended to discover in a television show or movie.But what doesn't make sense in the scene in the movie -- linked above -- is that Amos seems to have pocketed several balls at the left end of the table first. (The shots are not shown -- we only see Amos.) And the cue ball seems not to have moved from where we first see it at the start of the scene.
Possible but not probable as far as being on the 2 ball after multiple successful strokes playing 9 ball. The scene could have been choreographed a little better but the story line is the focus.