1) Regarding the inline popups, the overall goal was to educate first time users on how the site works (that ReelSurfer lets you cut highlights out of any video on the web). I agree that they are a little obtrusive though. Are you more opposed to the contents/frequency of those particular popups, vs popups in general, or both? We considered some other options like a help button or progressive UI disclosure - do you have a preferred means of surfacing this kind of info? Hopefully a small consolation now is that once dismissed, you should no longer see the popups on your next visit.
2) Regarding original URLs, that is a great idea. Currently there is one way to get to the original video - the "See More" button that displays on hover will take you to the original video's page (in this case, YouTube). We'll try to make it a little more prominent, or perhaps even add a link to the metadata below the player.
3) Regarding the branding strip for embeds, totally makes sense and you hit the nail on the head about wanting to capture users. It's definitely a challenging problem for us as we want to balance demonstrating the additional value of ReelSurfer (which is that you can cut and watch highlights + mashups from all videos across the web, not just YouTube) without getting super annoying. In this particular scenario, if the branding strip only appeared on hover (and disappeared during playback), would that be a better/tolerable experience?
Thanks again!