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To look at the "Phantom Glitch on The Arbiter", as soon as you start the level "The Arbiter", turn around and zoom in on the Phantoms. Then watch them, and shortly after they disappear into the clouds they will spin out of control, one even crashing into a platform below. The other two will keep on falling until they hit the bottom of the level. This probably happens because Bungie only planned a certain amount of route for them, when they reach the end, the games physics take over.
Also at the start of the video for that level, the Covenant Dropships seem to be in the foreground (i.e. when the Phantoms go past the dropships the Phantom appears to be behind them). You need to look closely but you can see it.
It is possible for the Phantoms to be scripted into being sucked into the maelstrom.