Mistakes Were Made solution
by Kegler

As revealed by the unclued gray entries, SOMEONE DROPPED THE BALL, thirteen entries have a “ball” dropped before entry.  The dropped balls are shown in red.

Mistakes Were Made solution grid

Across
5HOSPITABLE (SO HELP A BIT anag)
9C(RE)ASE
10P(UEBL)O + S (BLUE anag)
12OGRE (even letters)
13cLEAn
14DR(O)OL (LORD rev)
16NACHO (hidden)
20V + U,L + PINE
21ISTLE (TILES anag)
22ETNA (hidden)
23A + IS + LE
24PEER(ES)S
31MET + ERED (DEER anag)
34MARC + O (CRAM rev)
35HER + B
37C + I + RCA
39IS + LA
41TENO + R (NOTE anag)
42ThERMS
44F + ODDER
45WOR + N (rev)
46S(OYB)EAN (BOY anag)
47CELLAR (hidden)
48PAPERWEIGHT ("PAY PER WAIT" hom)
Down
1ORGANISM (rev hidden)
2MERCHANDISE (RED MACHINES anag)
3O(S,L) + O
4N + EEDS (SEED anag)
5HU(D + D + L)E
6O'ER (ORE anag)
7AB(O + V)E
8LOL + L
9CHARDONNAY (CORN HAY AND anag)
11STE(A)DFAST (FDA TESTS anag)
15bOUTS
17H + OLD
18S(TEP)MOTHERS (PET rev)
19PER + ME + rATE
25S + pECTORAL
26RESOURCE (hidden)
27DAZE ("DAYS" hom)
28G(R + A)NOLA (ALONG rev)
29JO(URN)EY + E,R
30SHRUBBERIES (BUSH BERRIES anag)
32ERLE ("EARL" hom)
33RIP + SAW (WAS rev)
36BARBECU + E (BEAR CUB anag)
38CZECH ("CHECK" hom)
40ST + O + A
41T(R)EE
43ME + R