B writes...

In "M.I.A.", after Goliath appears in the past and Griff saves him from the plane, Douglas asks "Clive, did you see that?" and Clive seemingly didn't. This greatly resembles the opening scene to the "Batman: The Animated Series" premiere episode, "On Leather Wings" (though it was obviously Man-Bat and not a Gargoyle in that case), which was then mirrored later in the DC Animated Universe as well as other shows.

My question is: Was that intentional here?

It always seemed ironic to me that the pilot being asked if he saw anything was named Clive when that's the name of the actor who played the pilot in the same position in the Batman episode (as well as Alfred for the first few episodes). Also, the "On Leather Wings" name and the humanoid bat in the episode seemed like a similar enough concept and Elisa does reference Superman in the previous episode, "Sanctuary": "This is a job for the Gargoyles."