Mac Update trailer

Notes

At the beginning of the video, the Sniper sees both a window, and a bitten apple hanging from a branch through his scope. The colors used for the glass of the window allude to the 'Flying Window' logo from the Microsoft 'Windows' operating system. The bitten apple hanging from the branch alludes to both Apple's current logo, and their original logo.
The company poster on the wall behind the Heavy reads "Jobbs' Orchards." This refers to Apple CEO, Steve Jobs.
At 0:23 is the first of many glimpses at the Frontier Justice, one of the unlockables later included with the Engineer Update.
The first hint to the existence of crates was also seen in this trailer, where the Soldier can be seen pulling various hats from a Mann Co. Supply Crate. Among these hats are the Tyrant's Helm, Texas Ten Gallon, Killer's Kabuto, and the Stainless Pot.
"Think Bullets," seen at the end of the trailer, is a reference to an old Apple slogan, "Think Different."
The music tracks used in this video are The Art of War (from Meet the Soldier) and The TF2 Theme.
At 0:05 to 0:06, the BLU Pyro running by is holding a RED Flamethrower.
When the Demoman first appears in this video, you can see that the sight on his Grenade Launcher is flipped down.
Training targets of the three Classes that aren't prominently featured in the video (the Pyro, the Spy, and the Medic) can be seen behind the Supply Crate the Soldier searches through.