I used to collect this one with the Tanooki Statue to beat the bubbles. Might be worth adding that method to the guide.

Also I don't remember the tail flick working to hit giant blocks in the NES version of the game, so in World 4-5 you need the Koopa shell I think.

Do you have a video of the 6-9 Tanooki strat? I gave it a try but couldn't get through. And yep you are correct with the 4-5 giant blocks. Thanks!

No video, sorry - you need to come out of the statue while still falling though, and pull right while the momentum is still pulling you down.