Development of Anchakkallakokkan began during the COVID-19 lockdown when a friend of Ullas Chemban shared an anecdote about a police officer.

Vasudevan, a meek and stammering youth arrives at the village the next day to take charge as police constable.

He conspires with Maveli Antu, the local politician, to arrange for someone to surrender to the police for the murder since elections are approaching, and they cannot afford to keep the case open.

The death gets passed off as unnatural due to her health condition, but Sankaran's neighbor finds out the truth about the circumstances.

Coincidently Sankaran gets out of the cell with the fake key made by his friend when he comes to do work at the police station and attacks Peter and Kolliyan.

Vasudevan, who was subdued by Peter and tied to a window escapes and revives his original aggressive self finally to fight and kill the 3 of them.

In the end, it is revealed that Vasudevan's father was a Porat drama artist and was a downright aggressive and violent man.

However, due to his paternal influence, he is also very violent by nature and is gradually raised as a timid person by his mother.

During the COVID-19 lockdown in 2020, Ullas Chemban found inspiration for the film from a casual conversation with a friend who shared a 10-second anecdote about a police officer.

Ullas found the anecdote amusing, and encouraged by his brother Chemban Vinod Jose, he began developing it by collaborating with co-writer Vikil Venu.

Ullas chose the title Anchakkallakokkan because it referred to the Boogeyman, a folklore figure commonly told by mothers across Kerala to discipline or coerce children to sleep by instilling fear during his childhood.

[4][5] Lukman Avaran, who worked on Chembosky Films' earlier production Suleikha Manzil, was approached by Ullas to play Vasudevan, an officer who joins the police as a rookie.

During their interaction, Ullas discussed her character, which required a different makeover and physique to align with the 1980s setting, which she found unique and interesting.

Impressed by his performance in Kammatipadam, Ullas cast Praveen to play the younger Gillapi brother, who is mute.

The scouting locations included Malayattoor, Athirapally, Kannavam, Bonacaud, and several areas in Idukki, the latter of which was finalized as Chemban felt it resonated with the narrative.

The film was primarily shot in Vandiperiyar and Kumily in Idukki, with another two-day shoot taking place in Palakkad.