When the unscrupulous scientist is going all manky after cutting his finger on a microscope slide, the special effects guy who is pumping the goop can be seen in the bottom of the frame, a pair of syringes in his hands, plastic tubes leading up to the actor.
Love the fact that this film is so technically inept that they allowed this to happen (on top of all the boom mics that enter the frame).
It's because the current home video release of the film is in open matte instead of proper pan & scan, so we see things that were always captured in the camera but not intended to be seen. If it were in proper pan & scan or even widescreen, the effects technicians and boom mics and such would've been cropped out. Don't blame the ineptitude of the filmmakers (although this is an inept film), blame the ineptitude of the DVD distributors for not doing either pan & scan or widescreen.
I mean, really, how many times will you look under Jabba's manboobs?