RORY: I feel dizzy.
LORELAI: Are you sure that’s not just the sight of Robert Reed in the tight clown pants?
Robert Reed, born John Robert Rietz Jr (1932-1992), actor best known for playing father Mike Brady in The Brady Bunch, and its various specials and spin-offs. From the very beginning, Reed was unhappy with his role as Mike Brady, feeling that the show was far too silly for a serious classically-trained Shakespearean actor such as himself. Although he got on very well with the rest of the cast and behaved professionally at all times, he often argued with the creator and producer over the scripts (he was allowed to direct a few episodes to appease him). Despite this, he appeared in all the specials and spin-offs, and actually really loved doing The Brady Bunch Variety Hour, as it gave him the opportunity to sing, dance, and have fun.
Note that the comment about his “tight clown pants” is yet another reference to clowns and circuses on Gilmore Girls.