Mathias calls Penny, informing her they "found it". ("Live Together, Die Alone")
Mathias was playing chess with Henrik in the tracking station when their computer started beeping. Henrik then typed something into the computer, while Mathias called Penny, speaking English. He reported to her about an electromagnetic anomaly, informing her, "I think we found it." ("Live Together, Die Alone")
- Damon Lindelof and Carlton Cuse mentioned Mathias' physical likeness to Jack in a commentary, and stated they cast the actor who "did not look like Matthew Fox." ("There's No Place Like Home, Part 2")
- Mathias, as well as Henrik, seem to be borne from a Norwegian environment, instead of a Portuguese or Brazilian one.
- Mathias is the Norwegian variant of Matthew. Mathias' name in Portuguese is Matias.
- The Gospel of Matthias is a lost text from the New Testament apocrypha, ascribed to Matthias, the apostle chosen by lots to replace Judas Iscariot. A different text, The Gospel of Matthias, is also the original name for the Gospel of Matthew.
- Of all the main characters Mathias has only met Penelope Widmore.