The PT Cruiser was from the DaimlerChrysler era, so it would presumably have the Daimler name on it somewhere. For markets outside of North America it was apparently built in Austria, likely in a plant which also produced Mercedes vehicles. I don't think there was any involvement from the European operations in the design; it was designed before the Daimler era, started with the Neon platform, and shares parts with the Neon (and other Chryslers, especially the Breeze/Cirrus/Status or "cloud cars")... but I don't think there's any Mercedes connection in parts or design.
It is an interesting design, with a rare use of rear beam axle located by a Watts linkage in a front-drive vehicle.
