Playmate 25: When you reach the hotel garage, Joe will stand around waiting for someone to come and open the shutter door. While he's doing that, wander off to the left of the locked door to find the one that's wide open.
Once you're through, immediately hang a right to enter a hallway full of industrial dryers, then a left at the next doorway. Walk forward a bit and you should see this office doorway to your left:
Go through that and look to your left. The chapter's first issue of Playboy is sitting on the corner of a desk at the far end of the room.
At the bottom, you'll find a metal gate blocking the way. The next issue is lying next to it.
Playmate 48: When you've finished up at the hotel and gone back to Vito's place, take a look at his bathroom floor next to the tub. It wasn't there when Vito left the house at the beginning of the chapter, but the next issue of Playboy will have magically appeared.
You'll see the next issue on a windowsill facing Leo's front yard.
Playmate 29: Immediately after grabbing Playmate 47, head through the door into Leo's bedroom. Then go through the door on your right, after which you should head left and open the door to the bathroom. The next issue is sitting on top of a hamper opposite the door.
Note that if you get caught while you're poking around, you can either "retry mission" to restart in Leo's office, or just let events play out for a chance to freely explore the mansion.
On the other side, you'll see a passed-out guy with magazines piled around him. The next Playboy is between his legs.
You'll find yourself in a dead-end hallway with the next issue of Playboy lying on the floor.
Playmate 33: Right after the shootout begins, you'll run up a staircase onto a catwalk. Head into the narrow hallwaythe catwalk leads into,and you'll find the next issue lying on the floor to your right.
Hang another left, and you'll head down this alley:
At the end of the alley, look to your left. The next issue will be hidden in a patch of weeds next to an overgrown dumpster. (You can also find this one at the beginning of the stage, when you're being led to the deal.)
Head straight past the gas pumps, and you'll see a container truck parked next to another loading dock. The next Playboy is lying just behind it.
Next page: Chapters 13, 14 and 15