To anyone reading this, spoiler warning
Spoiler warning again
Spoiler warning for the last time
Screwdriver on Safe n' Sound, and copy the revealed text (entirely, not just the quotes). In Bright Bulb, use the screwdiver to remove the big light bulb from the logo/banner/whatsitcalled. Drag it to the only lamp that doesn't light when you click on it, and turn every light on. Paste the text into Bright Bulb.
1 flag.
In Bright Bulb, ctrl + a to reveal the base64-encoded string of text, copy that, and paste into Encode, and click the arrow. This tells you to click on all the cats in Pet Parade; do it.
2 flags.
Zapper on Ghost Town (the sand), ctrl + a to reveal hidden text (type 'tumbleweed' into the text box)
3 flags.
Ctrl + a on Binary Basics reveals the answer to Pet Parade. (All caps! "B3ACHBA11", not "b3achba11".)
4 flags.
The challenge in Binary Basics can be copy/pasted into Decode to get 7462, which you then use at the bottom of Safe n' sound.
5 flags.
Dunno about the rumored 6th flag :P