The fights appeared in all but two storylines on the series. The first being the Zelda two parter early on in the first season and the second being the Nora Clavicle episode in the third season. For the first season the words were imposed over the live action ie you could see behind/around the words, this is personally my favourite preference. As during the second and third season, the words were superimposed over the whole screen. Season two you had a plain colour background with text on top and in the third season you had the same however, the background would flash. I believe the reason for changing it after season one was to make it easier and cheaper to edit. As putting in a slide with the word just before a punch lands, is easier that imposing it over on top of the filmed scene/video.

Here is a complete list of Bat-Fight words that appeared during the series and the 1966 movie. Holy onomatopoeia Batman!