Some guys who are drinking in a car invite Russell and William to a party. Russell then quickly downs such a cup and William tells him not to have any more. Moments later, we see Russell, rather high, standing on top of a roof, preparing to jump into a swimming pool below him. The next morning, Russell is still feeling the effects of that acid. People have drinks at a reception and later we see Penny with a bottle of champagne.
People do more drinking.
People drink beer after a concert. Russell, Dick and others drink while playing cards, while one guy inhales what's presumably pot. The band members and others drink at dinner. William finds Penny drinking and acting strangely. He then realizes that she's downed many Quaaludes and tries to keep her awake until help arrives.