When Batman infiltrates the Thanagarian command ship, his disguise is made to make him look like the late Alan Napier, who played the role of Alfred Pennyworth in the Batman (1966) TV show. Batman even uses a voice similar in sound to Alan Napier.
Hro Talak is an anagram of Hawkman's real name from the comics, Katar Hol. The name change was for several reasons: in the comics, Katar Hol is a good guy, and he's Hawkgirl's husband, and DC Comics did not allow the familiar Hawkman from the comics to be used because the character would act more like a villain than a hero. By creating a similar character but with a different name, the writers could make him a bad guy who's merely engaged to Hawkgirl.
Part of Paran Dul's name was taken from Paran Katar, father of Katar Hol, the original Hawkman.