To celebrate Halloween, which is just a few weeks away, Psyonix has released a Halloween-themed update for Rocket League. From today through November 1 players will be able to earn in-game Halloween-themed items for free.
All items are earned as post-match random drops, which means that all you have to do is play the game and hope you get lucky, winning or losing doesn't matter. The full list of items includes the following: "Ghost" Topper, "Netherworld" Rocket Trail, "Fuzzy Skull" Antenna and "Bone King Topper" Topper. Once an item is found, the player will keep it forever and will be able to use it at any time.
In addition, all the 2015 Halloween items are back for this event, meaning you have a second chance to get these. Psyonix warns that this is the last time you will be able to earn these items though, as they will be gone forever after November 1.
Source: Rocket League Official Website