Alan borrowed Walden's underwear and even the underwear that Larry was donating? That's gross! He's so cheap, he can't even buy his own underwear?! What's even more disgusting is that Larry was donating his underwear in the first place. In real-life goodwill will not accept used underwear, only underwear that's still in the package and never been used.
So Jenny got an audition. You know what would be good for Jenny? Since Jenny is an actress, she should start starring in commercials advertising about stuff like maybe tampons, wine or other things that girls(lesbian or straight) would like and then start living off the royalties she gets from them, just the way Charlie was living off the royalties he got for writing those jingles for commercial. She'd make some serious money because each time the commercial airs, you get paid royalties for it. Even before writing kid songs, Charlie was living a good life with the money from his royalties.