Assuming it is...what a first puzzle. While the theme itself didn't excite me, the theme answers were all multiword phrases...always a favorite of mine.
The theme is revealed at 65A: It can precede the first words of 17-, 28-, 35-, 47- and 61-Across (double).
17A: "Back to the Future" subject (time travel).
28A: Fans often have it (team spirit). Double team? Maybe someone can clue me in on this one.
35A: Earthquake site (fault line).
47A: Flaky sort (space cadet)...about how I felt by the end of the workday. It'll be a big relief to wrap up my huge project tomorrow. Ten-hour workdays aren't for me.
61A: C-E-G triad, e.g. (major chord). Piano lessons paid off yet again. This was an absolute gimme.
There were some answers that I don't recall ever having seen in a grid...among them:
1A: Cause of a skin rash (eczema). Disgusting, yes...but such a great word. The Z, preceded by a C...it's just too good.
14A: Quenched (slaked).
2D: Some newsletter pictures (Clip Art).
3D: Machine on a skating rink (Zamboni). The name has always reminded me of something good to eat...maybe zabaglione.
6D: Far from klutzy (adroit).
41D: Defensive wall (parapet).
50D: Alternatives to 'Vettes (T-birds).
44D: Spanish capital under the Moors (Cordoba).
I've always liked the expression helter-skelter, aside from the connection to Charles Manson. At any rate, I liked that it was used to clue two of the answers...12D: Enters helter-skelter (piles in) and 45D: Not helter-skelter (orderly).
Favorite clues in the puzzle:
10A: Bugle tune (Taps).
31A: Moonshiner's setup (still).
51A: Horror film staple (gore). Nice change-of-pace clue.
60A: Defaulter's loss (repo).
67A: It may leave marks (pox). Another gross one, but I liked its cross at 58D: It's "stronger than dirt" (Ajax).
68A: Doesn't stick to the straight and narrow (strays). As I looked over the grid before blogging, I kept seeing that as St. Ray's...maybe some sports team?
29D: Made a scene? (acted).
48D: Parts of analogies (colons).
I don't know how many times I'll struggle to remember 49A: Automaker Ferrari (Enzo)...should be a gimme by now. 57A: Simon Wiesenthal's quarry (Nazis) shares the Z...Wiesenthal was an amazing man. You can read more about him here.
For some reason, I loved 40D: "Puh-lease!" (spare me)...don't know why it struck such a chord tonight.
That's it for this one. Here's the grid...
...and I'll see you tomorrow.