T.G.
With my girls we just got one that hinges right to the toilet on top of the regular seat. Then you can just lift it up for the adults to use. It worked pretty well and was easy to clean. We occassionally got some pee on the seat that had to be wiped off with toilet paper but it wasn't anything major. The girls loved using it and I loved how we didn't have to take it on and off for every use and it didn't have any crevices to collect pee. We have a boy now though and I have sat him on it a few times. It is not going to work for him because there is not enough of a deflector. But for a girl, it worked great.
As far as movies, we have Elmo's Potty Time. The girls liked it and the little guy is interested too.