Presence and absence

Something that non-cinephiles donโ€™t know about movies and TV: In most films and shows, especially if they have any actors with recognizable names in them, if the actorโ€™s face is not actually in the shot there is a very good chance the actor โ€œinโ€ the scene was not on set when it was filmed.

The reason is that โ€œnamedโ€ actors are very expensive, and the more you can avoid having them work the less costly the production โ€” and often, the less hassle.

So if you see the โ€œactorโ€™sโ€ hand? Likely not them. The back of their head? Likely not them. Hear them talking but donโ€™t actually see them? Probably dubbed in later.

If you donโ€™t actually see an up-close shot of the actorโ€™s face in a scene, there is a really good chance they were not present at all when the scene was filmed.