In 04×16 Jerry turns 64 (or 16) whilst his actor Jim O’Heir was barely 53 in real life!
More: They did Jim O’Heir dirty in this episode Here’s a good post from https://reddit.com/r/PandR/comments/1hdjzjm/they_did_jim_oheir_dirty_in_this_episode/: In 04×16 Jerry turns 64 (or 16) whilst his actor Jim O’Heir was barely 53 in real life! More here: They did Jim O’Heir dirty in this episode