Crystal Palace's Christian Benteke celebrates scoring his side's second goal of the game during their English Premier League soccer match against Leicester City at Selhurst Park, London, Saturday, April 15, 2017.
The visitors broke from a Palace corner, with Mahrez setting Vardy free before the England striker cut back inside former Foxes defender Jeffrey Schlupp to curl his shot beyond Wayne Hennessey.
Shakespeare believes his side were unlucky to come away with just a point from the game but admits they paid the price for failing to kill off their opponents.
However, sloppy defending by the champions let Palace back into the match two minutes later as Cabaye took advantage of static marking and steered in a neat shot from 10 metres.
Robert Huth and Jamie Vardy looked to have set the Foxes on course for a comfortable victory at Selhurst Park before Yohan Cabaye and Christian Benteke salvaged a draw for the hosts.
"These are the days in which I say that the fans have to be there and what we need is that they not only come to see a football match but they come to be another player".
Crystal Palace manager Sam Allardyce: "When you finish a game with a point having been 2-0 down, you have to be incredibly satisfied". For those Leicester goals we did not get them right.
Christian Benteke completed Palace's comeback on 70 minutes, overpowering Yohan Benalouane to convert Andros Townsend's cross, though Danny Drinkwater went close to a victor for the visitors late on. "We're in good form and we've got a lot of confidence".
"We need the greatest effort of all the players we have". Despite fielding the same starting XI for the games against Southampton and Arsenal, Allardyce has been handed a boost by being able to select Fraizer Campbell on the bench after his injury lay-off, while Martin Kelly makes his 100th Premier League appearance. Before this run, they'd won five games in 26 attempts in the Premier League. Andros (Townsend) has turned himself into a top player.
Palace travel to Liverpool on Sunday, 23 April (16:30 BST), before another tough encounter, hosting Tottenham on Wednesday, 26 April (20:00 BST).
"On paper, the timing of the game should aid Allardyce's chances of getting that victory on Saturday, as Craig Shakespeare will surely be tempted to rest a number of Leicester's first-team regulars with Tuesday's return leg of their Champions League quarter-final against Atletico Madrid in mind".