Hey, I think this is an okay tab, but what I figured out looks a lot different. Yours is a good starting point, but it's not really complete in a few places. Here's what I got:
Look On the Bright Side
Standard tuning
Intro
E B A B x2
Verse
E B A B x3
E A B
Chorus
E B Cm A
E B A
repeat
Post-chorus 1
Cm B E A Cm B x3
A B
Post-chorus 2
Cm B E A Cm B x3
Cm B
Bridge
e|-4--5--7--7-|
B|-5--5--9--7-|
G|-6--6--9--8-|
D|-6--7--9--9-|
A|-4--7--7--9-|
E|-----5-----7-| x6
Outro
A B E x4