I spent almost half of my time today looking for an error, which is all the more pitiful because the error was the second Q in QUINQUAGENARIAN (17A: Person between 50 and 59). I went with a T when I first encountered it, and I'm almost happy that tVC (18D: Channel for TV shoppers (QVC)) didn't set off any alarms in my head. Of course, I did eventually realize that there were two Qs in two other answers, but there was also CUECARDS (38A: Orators' aids) (A true orator would probably eschew such things), and I guess I convinced myself that the theme was just a bunch of Qs all over the place. Ahh well, some days will be like that.
Once again, 1A: ACTV (End of "Macbeth" or "Othello") (C+) (the plus is for The Bard) was the first answer that I put in confidently. The answer that I put in the least confidently was OTOWN (73A: Central Florida metropolis, informally). Do they really call it that? And is that nationally known? Could I get away with the clue "Southern N.H. city, affectionately" for "ManchVegas?" I just might try it.