In the scrolling cast credits, two actors are listed twice, Colin Key (as Phil Walden and B-movie Director) and R. Keith Harris (as Pastor Salem and Marty), while Paul Duran's name is displayed on the screen at 01:24:37 (eighth among twelve principal actors) but is not listed in the scrolling cast role/actor credits.
Cast of the black and white "Two-Legged Alligator Man" B-movie scene (14:17 to 14:53) are listed in the ending credits, including Hot Blonde Number (aka Linda), the director, the cameraman, and Marty (the two-legged alligator man). Colin Key (Phillip as an adult) does double duty as the director while R. Keith Harris (Pastor Salem) does double duty as Marty.
Mark Freiburger mentions (at 03:55 in the DVD featurette) that within two weeks of his graduation from North Carolina School of the Arts he had moved to Edenton to begin shooting Dog Days of Summer (2007). After shooting in the summer, the production took a hiatus (Devon Gearhart was engaged in the shooting for Canvas (2006) in October and November, 2005) and shot the scenes with the adult Phillip Walden (a.k.a. Phil Walden) in winter.
Colin Key: as the B-movie director in young Phillip and Jackson's two-legged alligator man fantasy sequence.