Revealing mistake: Season 5, episode 8, "My Name is Mac Taylor": When the killer sets himself on fire, he's not wearing any gloves. In the next shot he is, to protect the stuntman from the flames.
Plot hole: At the end of the episode, Adam and Stella are checking how many others there are bearing the same name in a government database. "Stella Bonasera" gives one result, being the Bonasera character. A search for "Sid Hammerback" also gives one result, a 90 year old woman (the characters say it has to be his mother). But Sid himself should have shown up too, with the search yielding two results, not just one.
Chosen answer: Probably to broaden the scope of the show's plot and give the audience a chance to see the characters in a different setting, People act differently at home from the way they do at their workplace. By the ninth season, the characters would have become overly familiar and predictable. It gives the writers a chance to do something different with them.
raywest ★