Harley Quinn is a good show. I don't think it would have much re-watch potential, but I'm enjoying it, it's got a Simpson thing going where there is a HUGE supporting cast. Basically every DC character shows up at some point.
Oh yeah I remember the venerable OHP well - my Biology teacher used them all the time. Never regretted dropping Biology when choosing my GCSE subjects
And speaking of old tech...........how many remember having to do this, especially if it was your favourite tape?