The Dragon is very small compared to the ISS I had to use Binos to even find it as the sky was still light.. it appeared to be a lot faster than the ISS.
The ISS was quite bright tonight so if looking in the right direction is probably what most people saw
Use this site to follow the ISS and...
Probably an aircraft, all you see for the ISS is a bright white light and its silent.....you wont hear a thing....also flashing red is probably a nav light or anti col light on an aircraft.
I saw a shuttle launch many many years ago ( probably 25) the sound and ground rumbling was incredible. As I was RAF at the time we got inside Cape Caneveral to a military only viewing area.
15-20 mins after take off travelling West to east.....might be low in the sky estimating 2150......be early not to miss it
Look west just to the Right of the moon at 2120 the ISS will go over ( might not be dark enough for a good view ) but the SpaceX will follow the same path.
https://www.northstandchat.com/showthread.php?352518-Anyone-want-to-see-a-space-station/page4
see my post here it should be visible about 15-20 mins after launch in the UK skies