This is part 2 of my 100% Super Mario 3D World Walkthrough.
This part includes level 1-4 "Plessie's Plunging Falls", level 1-5 "Switch Scramble Circus", level 1-Toad "Captain Toad Goes Forth" and level 1-Castle "Bowser's Highway Showdown".
Below are the times when I get the stamp and green stars in each level.

00:11 - World 1-4 - Plessie's Plunging Falls
00:41 - Green Star #1
01:13 - Green Star #2
01:32 - Green Star #3
03:30 - Plessie's Plunging Falls Stamp Location
04:51 - World 1-5 - Switch Scramble Circus
05:36 - Green Star #1
06:33 - Green Star #2
07:01 - Green Star #3
07:46 - Switch Scramble Circus Stamp Location
08:28 - World 1-Toad - Captain Toad Goes Forth
08:53 - Green Star #1
08:58 - Green Star #2
09:05 - Green Star #3
09:22 - Green Star #4
09:28 - Green Star #5
10:22 - World 1-Castle - Bowser's Highway Showdown
10:45 - Green Star #1
11:09 - Bowser's Highway Showdown Stamp Location
11:29 - Green Star #2
11:57 - Green Star #3