Mark, thanks for your reply.
I'm actually surprised that the Beach Boys' musical assistance on "Surfin" and "Surfin Safari" was documented. However, if one thinks back to early 1963, the Beach Boys were still an up and coming group and it probably paid pretty well (better than a local dance) to play on a session.
I agree with jdman that Jan had Glen Campbell and Billy Strange playing on the sessions for the "Surf City" LP, as documented on the back cover, and probably didn't ask David Marks to play.
Of course, as I recall, "Surf City" led to hard feelings toward Jan Berry by Murry Wilson, who accused Jan of pirating "Surf City" from his boys. That is probably why any possible involvement the Beach Boys may have had with J&D's recording of "Little Deuce Coupe" was under the radar.
Thanks again for your responses.