The show's team have been praised for pulling off a successful hour-long broadcast yesterday evening, which featured two births and the death of long-standing character Carl King.
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Makarem, who plays Nikhil Sharma, told ITV2's Emmerdale Live: The Fallout that there was a small element of improvisation to the final performance.
Gennie branding Nikhil "a pig" was among the moments which were not included in the official script.
Makarem commented: "Throughout the show there were little differences - little things that people were bringing that weren't there before. It added an extra spice to it. You weren't quite sure if it was going to go right!"
Asked what is ahead for Nikhil and Gennie now that they are parents, the actor joked: "This birth should not have happened like this for a start! This is a military operation and it's completely gone wrong, so I'm not happy about it. I think he's going to put a regime in place and it's going to be very interesting."
Meanwhile, Sian Reese-Williams - who plays Gennie - told the ITV2 spinoff show that she was delighted to be given such a prominent role in Emmerdale Live.
She said: "I was really excited, genuinely just really excited. I've done lots of theatre and I was desperate to be in the live episode. I thought, 'Well, I'll probably get a line and that'll be fine'. But when I heard I was [giving birth], I was over the moon."
Emmerdale continues tonight (October 18) at 7pm and 8pm on ITV1.