Coronation Street fans spotted a problem as Sarah Platt announced she was pregnant in last night's episode.
Tensions exploded between the Platt and Barlow families on Wednesday's edition of the long-running soap.
Sarah is caught in the middle of the rivalry as she is married to Adam Barlow and tried to act as a peacemaker so they can have a joint family Christmas.
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The character played by Tina O'Brien rounded up each member on the Cobbles so they can sort out their differences, but this didn't quite go to plan.
Max Platt had earlier sabotaged Daniel Osbourne's carol concert and was slammed by Peter Barlow as a "feral little thug".
Shona and David stepped in to defend Max for his actions as the two families traded insults.
Sarah diffused the tensions by telling them she was pregnant, but Coronation Street fans were distracted after Shona's appearance on the show.
Eagle-eyed viewers spotted the character played by Julia Goulding was still wearing her ITV lanyard and erupted in hysterics at the gaffe on Twitter.
One user said: "Oooopsies #Corrie hawkeyes tonight, can you spot it"
@I_am_KenBarlow added: "Hey @juliagoulding, that Shona has nicked your ITV lanyard!"
Another user posted the photo and asked: "What’s wrong with this picture ? Some #Corrie fans have already worked it out… Can you ?"
Matt commented: "Her ITV lanyard is showing"
Coronation Street airs Mondays, Wednesdays and Fridays at 7:30pm and 8:30pm on ITV.
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