Several of Lampard's victorious side took the opportunity to reference the incident in January that led to Leeds being fined £200,000 after manager Marcelo Bielsa admitting spying on his opponents. And the Leeds fans chanted at Lampard about 'spygate'.
"'Cause all of the spies, are hidden away, just try not to worry, you'll beat us some day".
It is the first time in the history of the play-offs that a side has reached the Championship play-off final after losing the first leg at home.
Substitute Jack Marriott scored twice added to goals from loan duo Mason Mount and Harry Wilson as the Midlands club secured a Wembley showdown with Aston Villa for the prize of a Premier League return.
But Derby started well and, though stunned by a Leeds goal against the run of play, recovered to win a thrilling game 4-2 on the night and progress 4-3 on aggregate.
In a one-worded tweet captioned, "Mood", the tweet showed a video of one of the Derby press team screen recording from their iPhone.More news: Walmart takes on Amazon Prime with free, next-day deliveries
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Of course, Frank Lampard and Derby weren't happy, and they would have been even angrier when they were beaten 2-0 at Elland Road a couple of days later.
Stuart Dallas then levelled the scoring on the night, putting Leeds back in front on aggregate, but it couldn't stop the tide of Derby attacks.
And in their post-match celebrations, Derby players felt the need to rub salt into Leeds' wounds.
Both Lampard and Terry are taking their first steps in management this season after being key members of Chelsea teams that won the Champions League in 2012 and the Premier League in 2005, '06 and '10. I'm not going to lie maybe it is.
"I heard a lot of people saying that we were crying about Spygate but I haven't thought about Spygate for a long time. We have to enjoy the moment but now prepare for Aston Villa, but we'll be underdogs again", he said.
Marriott chipped in an 85th minute victor for Derby to see them progress and set up a clash with Aston Villa at Wembley in the final.