Which makes things very tough on me if I included The Man From U.N.C.L.E. in Earth-66's timeline.
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Interestingly, one of the many novels for the series references The Avengers TV series, along with a few other notable characters.
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If I split it up into the suggested separate realities (rather than having Superman, Batman and Wonder Woman be the same universe), then you end up with this craziness. Don't worry, as long as you ignore Batman '66 Meets The Man From U.N.C.L.E., none of this matters.
Earth-??
Adventures of Superman (1952-1956)
Earth-66 (George Reeves Superman variant)
The Avengers (1961-1969)
James Bond (1962-2002)
The Man from U.N.C.L.E. (1964-1968)
Batman (1966-1968)
The Green Hornet (1966-1967)
The Girl from U.N.C.L.E. (1966-1967)
The New Avengers (1976-1977)
Legends of the Superheroes (1979)
Window cameos
The Addams Family (1964-1966)
Lost in Space (1965-1968) (Batman '66 Comic Book Only)
Hogan's Heroes (1965-1971)
The Felony Squad (1966-1969)
Judd, for the Defense (1967-1969)
Earth-76 (Adam West Batman variant)
The Six Million Dollar Man (1973-1978)
Wonder Woman (1975-1979)
The Bionic Woman (1977-1978)
Anyway, regarding connections on different movies and shows:
Napoleon Solo has an uncredited cameo in The Glass Bottom Boat movie.
Please Don't Eat the Daisies has some crossovers with The Man from U.N.C.L.E., but I think they're more like the I Love Lucy/Adventures of Superman crossover in that they're not actually the guys from the show.
April Dancer also appears in S2 of the show. I don't know how to take this either. You decide.
Get Smart (1965 TV show) references the THRUSH organisation. I personally find it harder to take connections like this seriously though. There's no physical cameo linking it to the show, just an offhand comment about someone having worked for them at one point.