It's not a big secret that lots of times low budget filmmakers will re-use their own props, costumes, sets, and stock footage for other films. Troma Studios is a great example of this technique.
However, from time to time even larger studios have been known to re-use props from other films for other TV programs and movies.
To discover yourself more on how this technique has saved filmmakers money go over to Den of Geek which has listed a great top-50 list of Hollywood re-used props and scenes examples. Go here for the full list and the next time you watch a film or TV show see if you can spot any props that have been re-used.