Ok, I'm not very used to giving suggestions and I'm only 4/5k, so take these with a pinch of salt: -
3 - I think this move is more designed to set up a Chinese fuseki, but I never play them myself, so don't take that for certain.
5 - Encoling a 3-4 is probably better than approaching a 4-4, but your enclosure is facing away from your stone, W has a chance to play the ideal extension from both his 4-4 stone and your enclouse at K3 or K4.
6 - Be happy
7 - I'd back off high probably, but either looks fine to me. Stronger player may say one or the other is better.
11 - Either Q10/R10 or go all the way over to F3 if you want to develop fast.
13 - Looks cramped... but not sure what a better option would be.
17 - Jump to R8 works here I believe.
27 - I don't like the idea of having W play C13 in response here, you might get a two space extenstion still, but it should come under immediate attack. I think C14 would be better.
30 - You can still invade this shape as you noted
However, it's not the butterfly shape which you have a guaranteed invasion on.
31 - Possible to pre-emptively defend your group, alternatively something at the top centre area is probably biggest.
33 - This explains it far better than I can:
http://senseis.xmp.net/?Butterfly and
http://senseis.xmp.net/?364463Enclosure33Invasion
47 - The peep at D10 could become very annoying, think I solid connection would have been easier.
53 - Top centre is still large.
54 - I guess it's still connected, so it's not what you'd normally call a broken shape, not likely to do much though.
55 - Misclicks happen, sadly. We've probably all lost games because of them.
67 - Shape is a tool, the mouth shape is designed to be an ultra solid shape that virtually guarantees an eye, if you're already at the edge and have two directions to run in it might be redundant, locally maybe push down at E9 instead?
85 -
Connect back to your group!
100 - I think C2 kills you here.
109 - Hane at L4 looks a whole lot safer.
269 -
PeterN
black can atari first, causing white to form an empty triangle at C16. You can then pick which of the stones is more valuable to connect, based on whether the outside or the side is more valuable. The other stone will have already done its work by forcing white into poorer shape, and capturing the one stone will be quite slow for white if it can be done outright.
hane, you can think miai of E14 (W nobi, or B atari) and C15 (W tiger's mouth, or B pushes).
nobi E14, then 
connects D15, then you decide which cut to fix.
if 
simply extends F14, your 
good. Vital point. "Hane head of 2 (enemy stones)". You must have first read out the cut F13.
did you consider or read the double hane G15 ?
missed a huge vital point: ponnuki F12 !
funny shape -- what's this ?? Very close to a pass.
exact same mistake as 
exact same mistake as 
missed the vital point G4. First, G4 in sente, then you can jump ahead to J3 next, instead of the slow push H3 
, I just feared the cut,
...
and at 
. I likely made some mistakes and would appreciate any corrections. Also I'm not sure if the 3-3 invasion into the "small butterfly formation" at move 
lives at all (see e. g. variation on 
) and would be glad, if someone could shed some more light onto that position 
