The first Coronation Street episode shot after filming resumed aired tonight - and it was pretty easy to spot.
Nick Tilsley's hair changed colour throughout the episode and he also grew a beard in the space of about 30 minutes.
Some of the episode will have been shot months ago while other scenes were filmed when the cast and crew were allowed back on set after the coronavirus lockdown.
In the opening scene Nick had grey hair as he spoke to his partner Leanne Battersby.
The character, played by Ben Price, was later seen back in their flat with shorter blonde hair and a beard.
And viewers were quick to notice the hilarious gaffe.
One tweeted: "Nick clean shaven in the morning and has a beard later on in the day."
"Has Nick gone grey overnight?!" another posted.
A third said: "Laughing, Nick had long hair and no beard and in the next scene his hair was shorter and beard had grown back...mad thing break in filming."
"What's Nick using to grow that beard?" another asked.
Ben decided to dye his hair go grey during lockdown.
He admitted he'd done it out of "boredom".
Speaking in May on the Sofa Cinema Podcast, he said: "I got some shampoo. You know you've gone blonde? I got grey."
* Corrie airs Mondays, Wednesdays and Fridays at 7.30pm on ITV
