Maybe it' a design decision by the dev, to show the videos only once, but personally, i like to watch scenes a little bit longer .
(Just to get the full cinematic impression the director wants to express

)
So, if you have the same opinion , you can open a terminal in the game folder and do :
Code:
find . -iname "*.rpy" | xargs sed -i -e 's/loop=False/loop=-1/g'
all videos will be looped then .
Cheers,
Kalle