Pulling off my door casings to replace them, I noticed a lot of hammer marks on the drywall. "Why?" I wondered. Now I know. The drywall is poorly aligned with the jamb, with close to a 1/4" gap when I make the casing parallel to the drywall. I'm guessing the workmen pounded the drywall to make the original casings fit at all.
I suppose I can caulk the gaps, but I'm hoping there is a more elegant solution. Thanks for any thoughts.