Their opening goal at Selhurst Park had felt trademark in its construction, which merely added to the Palace's frustration, given that there should at this stage be few secrets when it comes to Leicester's prowess at dead-ball situations.
The result left Palace above the relegation zone on 35 points from 32 games, two behind Leicester who had taken a 2-0 lead through Robert Huth and in-form striker Jamie Vardy.
However Palace grabbed a goal back within two minutes through Yohan Cabaye and the comeback was complete 16 minutes later when Christian Benteke climbed above Yohan Benalouane, legally in the eyes of the officials, to head in Andros Townsend's cross.
You could argue Leicester were recovering from their midweek trip to Spain and had one eye on Tuesday's Champions League return leg with Atletico Madrid.
Leicester have won three successive matches against Crystal Palace, their best run in all competitive meetings since 1925.
Crystal Palace: Hennessey, Mandanda, Speroni, Ward, Kelly, Delaney, Sakho, Fryers, McArthur, Milivojevic, Ledley, Cabaye, Puncheon, Townsend, Kaikai, Zaha, Sako, Schlupp, Van Aanholt, Lee, C Benteke.
Leicester City: Schmeichel 7, Simpson 5, Benalouane 6, Huth 8, Fuchs 6, Mahrez 5, Ndidi 6, King 5, Albrighton 6, Ulloa 5, Vardy 6.
Five wins out of six is impressive in any language and although perhaps at their most dominant against Arsenal on Monday night, that did come against a rival who do not need much of a nudge at the moment to topple over in spectacular fashion.
NDP election platform announced
Horgan also took on Premier Christy Clark's recent promise that the Liberals would cap bridge tolls at $500 per year. A homeowner grant provides a $570 break in property tax to people who own homes worth less than $1.6 million.
It is Parish's hope that when Brexit is finalised those eight will be able to play for the Home Nations, and also that Palace can benefit from such a change.
"It's that simple. They weren't anywhere near where we put them, sadly which is why he ran in with a free header and scored".
Leicester captain Wes Morgan will miss a sixth straight match because of a back injury, although he may be fit to face Atletico Madrid on Tuesday.
The teams in the Premier League have just a handful of games remaining, with plenty at stake in the five 3pm kick-offs on Saturday.
Palace struck back impressively and were back in the game inside two minutes.
"But unfortunately for me, the players forgot - it is that simple".
"I'm pleased with Benteke, with his game coming on and the goals coming back", Allardyce said.
"Since the transfer window shut, we have been building a mentality and resilience in the players", Allardyce said.