COIN/ITEM LOCATIONS FAQ - Also available at www.gamefaqs.com

DETAILED COIN CHART: Coin Chart
DETAILED ITEM CHART: Item Chart

Movie:CLIMBING THE ENDLESS STAIRS (Provided by gera2000)

Lethal Lava Land: (Collecting the difficult last coin)
PUSHING THE BULLY FOR THE FINAL COIN

Snowman's Land: Coin #127
COLLECTION OF THE SECRET COIN (CORRECT CANNON ANGLE)
THE SECRET COIN - VIEW 1

Tiny-Huge Island: Coin #192
THE IMPOSSIBLE COIN

Some BETA Super Mario 64 Pics:
These pictures just show some small differences in level design / enemies.
ZIP archive with 24 pics

From the GameFAQs board: Topic Archive

Tower of The Wing Cap: 53 Coins Max in One Run Through
Note: On furthur inspection, I actually think that at least 54 coins are possible. However, I haven't done this yet.