Not sure if you are aware but this site works like that of Wiki where we (the posters/viewers) assist with adding info and/or changing it. So if you have the time and patience then you are welcomed to add his credits to those other episodes.
I've notice where dancers whom became actors don't have listings of the video's and/or musical's they performed in just because those things were not as big as perhaps the movies and/or TV shows they later were credited with. I personally at one point started adding info for this dancer turned actress that I like but realized how much time goes into doing such. So now and then if I feel up to such I will but usually I just make note to that individuals fan base via threads like this.
So perhaps just adding a thread within his board stating his other many jobs like being a drummer would be good for his other fans to take notice about.
Poop in his hand Poop in his hand