Retcons are an in-universe way to explain a paradox that has occurred via time travel. Retcons mainly occur when a character has changed something in the past, either by moving an object or simply by interacting with those around them. When a paradox occurs, it has ripple effects down the relative time line, until it reaches the travellers PTP.
Out of universe, a Retcon is a section of the comic that when revisited, shows a different image or text. This effect is done using cookies on your browser. [cn] Some Retcons are miniscule, while others are noticeable immediately.
There has been one occurrence of a meta-retcon, in which the author Zack has stated that some pages were to be considered non-canon. This decision took several days to make, and was very hard for him.
Internal Retcon Edit
An internal retcon is a change in the continuity of the story that arises due to forces within the story itself, often as a result of a specific type of time travel.
What Kind of Maggot Grows in the Corpse of a Day? Edit
Portal through wall Edit
Office Shovel Murder Edit
The Castillo/Edwards swap Edit
External Retcon Edit
An external retcon is a change in the story that Zach makes to prevent the story from ending. Since All Night Laundry is an interactive webcomic, there is a chance that the users create untenable situations.
B13's Death Edit