They forgot to throw in the squeaky sound effect when the mausoleum door was opened and closed. Or maybe they thought squeaks would detract from the general spookiness. Either way, I sure wasn't complaining.
Barnabas probobly got Willie to oil the hinge.
And I wish I knew exactly what went on in Jason McGuire's head. But if I knew, then Jason wouldn't be Jason - or else I wouldn't be myself.
Jason did care about Willie, but he also didn't want Willie to tell everyone what he was up to