The relegation battlers picked up a precious point in their survival bid by holding play-off hopefuls Brighton in a London Road deadlock to extend their unbeaten run to a club record 10 matches at Championship level.
But it could have been a very different outcome had referee Robert Madley sent off Albion's Andrew Crofts for cynically chopping down Lee Tomlin as he bore down on goal midway through the second half.
Incredibly Madley allowed play to continue after the most blatant of offences, much to the dismay of Ferguson and much to the relief of Brighton boss Gus Poyet who graciously admitted Crofts should have seen red.
Crofts then came within millimetres of rubbing salt into the Posh wounds when hitting the bar with a last-gasp diving header.
Ferguson said: "I have regular communication with the referees' chiefs. All I ask them to do is have a look at any big decisions that I feel have gone against us and let me know if they think the referee has got it wrong.
"I have had six phone calls apologising for bad decisions already and I'll be getting a seventh tomorrow (Wednesday) if they have anything about them. I know referees are only humans and you expect the odd mistake, but seven is just not right.
"Crofts told one of our players that he had no choice other than to take Lee out in that situation. It could be a big moment in our season but we will be fine if continue to show the magnificent effort and commitment that we displayed here. The lads put in a terrific shift against a very good team, especially as the game came so quickly after a big performance at the weekend."
The main talking point was undoubtedly Crofts' lucky escape from an early bath on a night when Brighton climbed into fourth place, with Poyet admitting: "I can't remember the last time we had a bit of luck like that. There is no doubt Crofty should have been sent off but luckily for us the referee got it wrong.
"People will say that on another night the two efforts which hit the bar could well have gone in, but then again we could also have received a red card as well. We put in a serious performance to get what I regard as a good point at this stage of the season. Peterborough have beaten top teams in Cardiff and Watford recently so the first job was to be solid and keep them quiet before looking for a chance to score."