Cool theme today. I don't think I've ever seen anything like this in a normal M-W themed puzzle. The word RECORD is BROKEN (37A: With 40-Across, repeat offender? … or something found, literally, in four rows in this puzzle) across black squares. Twice it is broken across two words, twice across three words! Pretty snazzy.
This took me quite a while, and I ended up with a DNF because I did not know MOHEL (9A: Bris officiant) (tried "rabbi" to no avail). I also had "mOuSECAR" for HORSECAR (11D: Transportation in Disneyland's Main Street, U.S.A.), and CORDS (19A: Parachute parts) was still floating somewhere up, away from my mind. Tried "pal" for MAC (9D: Buddy)… in short, it wasn't pretty.
The whole thing seemed a little on the hard side, with tricky clues like "51D: Way" for MANNER, and "48D: With bitterness" for ACIDLY.
Seeing RODCAREW (38D: Baseball Hall-of-Famer mistakenly listed in "The Chanukah Song" as a Jew) in there was fun, and it's interesting to get that correction printed. I looked on Wikipedia, and it claims Carew actually wrote Sandler to correct him, and Sandler later removed his name from the song when he sang it again.
SUMAC (5D: Poison ____) makes us think of the famous George Bernard Shaw anecdote - when he was asked "Did you know that "sugar" and "sumac" are the only two words in English which begin with "su" and are pronounced as "she?" He replied: "Sure!" Heh. As with most of those anecdotes, we hope it's true.
BATANEYE (37D: React, just barely) is nice. ENDORSED (12D: Backed) is good. RACIER (53A: Less likely to be G-rated) and TURNRED (7D: Flush) are a nice pair.
Overall, I liked the theme quite a bit. There's quite a bit of junk fill, but I still enjoyed the challenge. Sue me.