What are the best and worst usages of footage from a previous movie in a sequel?
This was very common in the '80s: having the next entry in a series (Friday the 13th and Rocky were notorious for this) start with the last five minutes or so of the previous entry. Unfortunately in the former's case this only worked to highlight the blatant differences between the looks of each Jason, and in some cases the disparity between the skill of the directors (the beginning of part VII: The New Blood only suffers when the best part of it is the opening with the end of part VI).
When a series has the same director (Lord of the Rings, Spider-Man) old footage can be woven in fluidly as a flashback. Other series without the same director, however, attempt this with differing results: for instance, I love the Harry/Voldemort duel of wills in Order of the Phoenix that incorporates lots of footage from the earlier films. The Harry Potter series has years of multiple films and the benefit of the same actors visibly aged. Silent Night, Deadly Night 2, on the other hand, is notorious for relying on footage from the first film!
So what's the concensus on using old footage? Generally I think it should be avoided, as a sequel should be able to tell its own story with natural connections to its predecessor(s). On occassion, however, old footage can be used to strengthen a narrative.





