Yes - someone added the side mount, probably for a cymbal. They don't come stock like that.
Edit: on second thought, I'm wondering if that 18 is a floor tom to bass drum conversion.
It could be done by adding spurs and the mount. Anyone know if that series of Tour Customs
was available with an 18" bass drum?
The 3 hole mounts are really cool. You can use it to mount a 3rd tom, or more usually a cymbal.
Someone here got really creative with them.
It looks like he reversed one, then stuck another one in, both in a stand - easier to see than describe: