The name Pewdie gives to his accomplice in Journey is Bengt Magnusson. There's a Swedish journalist and TV presenter with the same name.
Pewdie has his own radio show time at a Swedish radio series called Sommar Pratare where he gets to talk about any topic of choice and choose whatever music to play. He mostly talks about "PewDiePie" but a big highlight of the show was his story of meeting Marzia online and having their first kiss once they finally met in real life. The song he chooses to play after this segment? "First Day of My Life" by Bright Eyes, which was the music in Marzia's video to Felix.