Bruce mentions that gorillas are more intelligent than most people presume, likely referring to his encounters with Grodd in Justice League, and how he faced the gorilla Peaches who was under the Mad Hatter's control in The New Batman Adventures episode "Animal Act". In that episode, Bruce also saw how two bears knew an access code, and realized they were "too smart", which is exactly how Terry feels about Fingers.
The Gotham Studios logo is similar to the Warner Brothers logo.
The man that Fingers frightens away in the park seems to be the same one Batman saved in the train in "Hidden Agenda". He also makes a cameo in "Rats" and "Countdown".
First time the Batmobile has been shown to have stealth capabilities.
Fingers' rooftop escapades appears to be a nod of the head to King Kong.