Similarities with The LEGO Batman Movie
In The LEGO Batman Movie, Joker thinks he has a "special relationship" with Batman. In The Batman, The Riddler thinks he works together with Batman.
I couldn't stop laughing at the whole scene in Arkham between Batman and The Riddler where Batman keeps denying that he helped The Riddler and then The Riddler can't cope because Batman "rejected" him.
Exactly like this scene:
https://youtu.be/3BkmHfh-mcY?t=29s