Danny DeVito mentions it is his fifth time hosting during his monologue and is inducted into the Five Timers Club. But it was actually his sixth appearance as a host. Apparently the time he co-hosted with Rhea Perlman in 1983 did not count.
The last show before the new millennium featured recurring characters/impressions in every sketch: Arnold Schwarzenegger and Tom Brokaw during the cold opening; Mr. Peepers during the monologue; The Delicious Dish; Mango; The Boston Teens; The Ladies' Man; Fun with Real Audio; Al Franken's Me Decade on Weekend Update; Sally O'Malley and Claudine Parker.
Jim Carrey was originally supposed to host the 1999 Christmas show to promote Man on the Moon (1999). He had to drop out due to scheduling conflicts and was replaced by fellow Man on the Moon co-star Danny DeVito.