(OOG) According to the series creators, the infamous “Skully” mask from Entry 26 was originally intended to be a hint towards Jay having an alternate “masked” personality similar to Masky and Hoody. This idea was eventually scrapped; however, this apparently doesn’t necessarily mean that the character in the mask isn’t still out there somewhere.
(OOG) Hoody was only played by Brian Haight a handful of times, including Entries 66 and 83. In every other appearance, the main three actors took turns in the costume in order to prevent fans from making assumptions based on the character’s build.
(OOG) Many of the locations used for the series have been graffitied with Operator symbols and other Marble Hornets references. The series creators have asked on multiple occasions that fans not do this.
(OOG) Marble Hornets was the very first series featuring an incarnation of the Slender Man (the Operator). Introduction and Entry 1 were uploaded only ten days after the initial creation of the Slender Man on the SomethingAwful forums.