With West Ham 1-0 up through a first-half Ravel Morrison strike, Jaaskelainen dropped a cross and in a moment of frenzied panic, he dived desperately towards the ball and felled Norwich forward Gary Hooper, who lashed home the spot kick to equalise.
"It was three mistakes in one," Allardyce said, "He [Jaaskelainen] loses the first one, tries to grab the second one, loses it again and then he got so desperate that he goes lunging in to try and get himself out of trouble and he ends up giving a penalty away."
He added: "Jussi is gutted. You can see it in his face. It's one those unfortunate errors that goalies can make. It's happened at a time where we didn't really want it to happen. It was a costly second half for us that we didn't expect."
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