June 19th is a recurrent date in the Don't Hug Me I'm Scared series, having numerous appearances and references through the episodes.
Don't Hug Me I'm Scared
The calendar says June 19th.
Don't Hug Me I'm Scared 2 - TIME
The calendar from the previous episode can be seen at the start.
The photo that Tony pointed to of the three puppets together was taken on June 19th, 1955.
In the Victorian animated scene, there is a poster on the wall stating that Yellow Guy is wanted dead or alive, and that the reward is £1906 - the 19th of June. (19/06, if the day is placed first as it is in the U.K.)
On the blackboard that Duck Guy points to, there is an equation which states that π is equal to 19.6(y) - again, the 19th of June if the day is placed first.
Don't Hug Me I'm Scared 3
The "missing" poster at the very beginning of the episode says that the main characters were last seen on June the 19th.
Mr and Mrs Dead's tombstones say that they both died in 1906.
Don't Hug Me I'm Scared 4
The calendar makes another appearance after taking a break.
It can even be seen in the digital world.
On the cork board behind the globe there is a note saying "Roy: 077 19 06 7 482".
The "Numbers!" chart has the numbers 19, 06, and 55 in a row
The newspaper was published on the 19th of June.
The computer displays 19:06 when it says it can tell the time.
Don't Hug Me I'm Scared 5
The calendar that says "June 19th" returns once again.
The calendar can also be seen in the painting on the fridge.
On the fridge the note saying "Roy: 077 19 06 7 482" returns.
The "Numbers!" chart returns from the previous episode.