OK, a few things.
1 To answer the original question of this thread... Scooter appeared in the first episode guest starring Juliette Prowst, and then in the Jim Neighbors episode as if he were appearing for the first time. Well, this is how they made the show, a bit inconsistant if not confusing, but true.
2 Though there may have been different airing orders, it's generally aggreed upon that there's a numeric order for the episodes.
Season 1 Episodic Numeric Order.
1 Juliette Prowst.
2 Connie Stevens with Bert and Ernie.
3 Joel Gray.
4 Ruth Buzzi (who later became part of the SS family.)
5 Rita Moreno.
6 Jim Neighbors.
7 Florence Henderson.
8 Andy Williams.
9 Charles Aznivor.
10 Harvey Coreman.
11 Lena Horn.
12 Peter Ustinov.
13 Bruce Forsyth.
14 Sandy Duncan.
15 Candace Berghan.
16 Avery Schreiber.
17 Ben Vereen.
18 Phyllis Diller.
19 Vincent Price, featuring Uncle Deadly.
20 Ethel Merman.
21 Twiggy.
22 Valerie Harper.
23 Kaye Ballard.
24 Mummenschanz.
Hope this helps and enjoy the show!