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However, eagle-eyed fans picked up on one small detail that wasn't meant to be seen in the latest episode of the BBC crime drama, as a member of the crew appeared on screen.
Take a look at the incriminating scene below (but you'll have to be quick):
In the scene, Detective Inspector Steve Arnott (Martin Compston) enters the lift after an AC-9 routine drugs testing into the AC-12 team. However, it appears he's not alone, as fans also noticed the show's cameraman, who was visible in the glass reflection of the lift.
Cameraman spotted on Line of Duty in the lift!! #LineofDuty #LineofDuty6 pic.twitter.com/FKDcfZAPbg
- Megan Murphy (@mmeganmmurphy) April 4, 2021
"Cameraman spotted on Line of Duty in the lift," Twitter user Megan Murphy wrote.
And it's fair to say the show creators have a sense of humour, as they replied: "Or was it..." with a GIF of DCI Joanne Davidson swearing in anger.
Other fans were quick to point out the mistake too.
One fan Tweeted: "Everything ok Steve, you seem to have a TV camera in the lift with you there," while another wrote: "Hello cameraman," adding a wave emoji for good measure.
Whatever the reason for the blunder, it seems that Steve has got a lot on his plate this season.
"Something going on, sir?" Steve asks Hastings in the scene that immediately precedes the DI entering the lift.
"Yeah, just AC-9 routine drugs testing," he replies.
Steve then says: "I've got to get over to check on the surveillance at Terry Boyle's approved premises."
"Yeah, well you know you're not on their list Steve. I told them you aren't available today," before Steve replies "Cheers Gaffer."
Steve then heads out to compose himself in the lift after his near-miss with the drugs team.
Line of Duty fans will remember that Steve hurt his back after an accident in series four.
While on his way to question DCI Roz Huntley's husband Nick, he is attacked by a balaclava-wearing assailant, who hits him with a baseball bat, before throwing Steve down a flight of stairs.
Since then, Steve has been heavily reliant on painkillers. Could his secret about to be exposed?
Line of Duty airs on Sunday evenings on BBC One.
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