Across Words
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Answer: SWEET CHILD O MINE

The crossword can be solved as usual, subject to some occasionally tricky across clues and unlabeled down clues:

A S B D T
1 M Y S T E R Y D I G H
O E T S E
2 T R I V 3 H T M L B
4 H E N I 5 P E R I F O
E A E 6 P E S T E R E D
S 7 N E W H I R E S O Y
E U O I E M I
V R 8 N A N C Y D R A W N
9 E A S E D K 10 F E L T
N I E I 11 E T S H
12 D A N B R O W N 13 D E T E
I G G 14 F I R M L
A H B O T I I
L O 15 L E A F C R O W N B
16 S E M I F M R 17 S I R
M 18 E N E R G Y I 19 T S A
Y F 20 I O T A N 21 E A R
22 S T J O S E P H C 23 R A Y
T R N U H C
E 24 M A D A M E R I S E
R E S B E
25 Y A R D 26 S I X F L A G S

The down clues are all enumerated by "#"; replacing each # by the length of the answer (summing up multiple word answers to a single total length) yields the sequence 19 23 5 5 20 3 8 9 12 4 15 13 9 14 5, which, when converted to letters, gives the answer SWEET CHILD O MINE.