1) As presented in the movie, the observation window into the Fontainebleau's swimming pool would appear to be directly to the (male diver's right) side of the diving platform. However, if you look at the bottom of the pool, you can seen the swimming lane lines emanating directly away from the window. Therefore, the window must be at one end of the pool, either directly underneath the platform or at the far end. Since the ocean can be seen in the distance behind the indoor ice skating rink, the observation window must be at the far end of the pool (i.e. underneath the cabana area).
2) While search for clues to Bond's room number at the Fontainebleau, I was pleased to spot "309" over his personal cabana. The number can be seen as he dons his terry-cloth jumper. However, after Goldfinger descends from the staircase and greets Mr. Simmons, the number changes to 308. A young couple is now standing in front of room 309's cabana. "308" can be clearly seen as Felix says, "That Goldfinger's a fabulous card player."
3) As Bond crouches down by the refrigerator to look for more champagne (which he refers to as "passion juice" under his breath - what a cheesy line!) there's a box of hamburger patties on the top shelf. However, when he wakes up from Oddjob's karate blow, the box of patties has been replaced with a bottle of champagne! Perhaps Oddjob got hungry while he was painting Jill, then felt guilty for eating Bond's hamburgers, and left him a bottle?
4) This isn't a blooper, but an observation. Imagine you're Mr. Simmons and you've been losing all week to Mr. Goldfinger. Aside from the painfully obvious fact that you're a masochist with a gambling problem, what would you make of Goldfinger's reaction to losing his first card game? The guy's been taking you to the cleaners all week and suddenly, when he loses a hand, he snaps his pencil in half! For me personally, being unaware that 007 is ordering my opponent to lose the hefty sum of $15,000, I'd think Goldfinger was a reeeaaallly sore loser (and a psychotic nutcase) and would excuse myself from the card table.
(Side note: Maybe Goldfinger's display of anger against the pencil isn't because Bond has gotten the better of him but rather is because he suddenly realizes that Operation: Grandslam is on such a tight budget that, without the extra 15K, he now won't be able to afford to use his laser on Fort Knox's front gate as well as the loading bay's garage door.)