Flash's hallucination sequence features several references to various covers of different Flash comics: Overweight Flash - Flash #115: "The Day Flash Weighed 1,000 pounds" (1959); Puppet Flash - Flash #133: "Plight of the Puppet Flash" (1959); The three-sided mirror/distortion - Flash #105: "The Master of Mirrors!" (1959) & Flash #136: "The Mirror Master's Invincible Bodyguards!" (1963); Big-headed Flash - Flash #177 (1968), Green Lantern #13: "Duel of the Super-heroes" (1960) & Justice League of America #7: "Fun-House Mirror".
Salovar's line to Flash ("Get your paws off me...") is a takeoff of a famous line from 'Planet of the Apes.'
The opening line, "What's the old saying, 'Mad dogs and Englishmen'?" refers to the song of the same title by Noel Coward, beginning "Mad dogs and Englishmen go out in the noonday sun."