The upper right corner of the rear side has a vent for an optional 120mm fan.
The five vented PCI slot covers are pictured below. There's no tool-free mechanism, expansion cards have to be secured with a regular screw but unlike other cases the cards are secured to a piece of metal that sticks out of the exterior of the case.
Right next to the PCI slots is a bracket that's attached to the rear with two thumb screws. The intended purpose of this slot is unclear to me, at first I thought it was a vertical PCI slot for a fan controller knob but it can't be used this way.
This tiny black knob lets you control the speed of up to four fans.
And here's the PSU mounting bracket. The V354 supports standard ATX power supplies but to conserve space Lian Li decided to mount the power supply vertically. To install a PSU you need to remove the bracket, attach it to your power supply with four regular screws, slide it back in and secure the bracket to the case with the four thumb screws.
The bottom reveals four HiFi-style feet and lots of holes, some of these are used to install 2.5" SSD/HDD devices.
Manual and extras
Lian Li includes a one-page manual, translated into four languages (English, German, French, and Spanish), as well as a list of most of Lian Li's PC accessories.
The box with accessories contains three bags of screws, a USB 3.0 to 2.0 converter, a motherboard speaker, a clamp + cable tie for some limited cable management, and a PCI bracket.
Here's a closeup of the PCI bracket, it's used to guide the cables from the two front USB 3.0 ports to the rear USB 3.0 ports of your motherboard.