Unintentional derails Edit
Self-inserts or inserting off-topic characters into whatever scenario it's portrayed by a drawing or caption can sometimes lead to a derail. For example, if someone writes the caption of "a man with a dog", and the artist draws Superman with a dog, this can lead to what some users would regard as a derail. However, many arguments have broken out over people mislabeling people as derailers. If someone chooses to create a game with the very first caption being very vague, then someone misinterpreting it should be expected.
What isn't a derail Edit
There is a big difference between of not getting a reference and a derail. If someone draws Olaf from Frozen franchise and a user who has never seen Frozen writes "Snowman", that's not a derail, but if someone draws a picture of the sun and someone writes "candy cane", then it is. As mentioned earlier, misinterpretation isn't a derail.