[harryc2011]

This happens on the BBC (which is ad-free) & it drives me mad! E.g. Dragons' Den is clearly pre-formatted to be sold to commercial channels with ad breaks - there is about 20 mins of content in a 1 hour show w/ 40 mins of recaps and dramatic panning around the 'Den'.

[acomjean]

Martha Stewarts cooking (show on ad free PBS) has a tacked on "Bonus Feature" at the end that seems to be just the right amount of time that it wouldn't be needed if they were showing ads.

[jon-wood]

I'd never clocked that, but all the BBC's nature programs have a 15 minute "making of" documentary at the end as well, which now you mention it must get cut for commercial networks.