
in order to create a link to a youtube video that will start playing at a specific time all you need to do is add "#t=" and the number of seconds into the clip.
for example, let's say I want to show someone a specific shot from my reel, let's say it's at 1:14.
so 1 minute + 14 seconds = 74 seconds.
my reel link is: http://www.youtube.com/watch?v=_2Eaq16uAP4
so the link should be http://www.youtube.com/watch?v=_2Eaq16uAP4#t=74
for HD links all you have to do is add "&hd=1" to the end of the link, assuming that it has a HD version. so my link should be now http://www.youtube.com/watch?v=_2Eaq16uAP4&hd=1#t=74
(notice that the HD tag is coming before the the time reference, otherwise it won't work.)
happy linking!!