Mistakes Were Made
by Kegler

The completed grid reveals thirteen “incorrect” answers.  The unclued gray entries, read from top to bottom, spell out a four-word phrase that describes what happened.

Across 5 Friendly crackpot, so help a bit 9 Fold note in attaché 10 Blue novel set in post office: Small Towns 12 Monster forgeries taking only seconds 13 Pristine, unbounded meadow 14 Slaver magnate from the East carrying ring 16 From Sweden, a chocolate chip 20 Very unusual, extremely long, and foxy 21 Tiles lashed with fiber 22 Mountain bridges get narrow 23 Initially, Avignon is the French passageway 24 Aristocratic female looks over couple of estates 31 Ran into wild deer like a taxicab, perhaps 34 Polo stuff returned with ball 35 Seasoning that woman's piece of beef 37 Around second of October, start to investigate TV manufacturer 39 Is Los Angeles an island in Mexico? 41 Singer is red after wrong note 42 Units of heat, except for hot conditions 44 It's used to feed loud stranger 45 Ragged end of nylon scrap faces the wrong way 46 Actor Connery holds bouncing boy and plant 47 Parcel largely has room at the bottom 48 Bear the cost for each delay, we hear, for desk accessory

Down 1 Being featured in films in a group making a comeback 2 Red machines producing items for sale 3 Circles around borders of Senegal's capital city 4 Requires new seed sown 5 Shade covers two dates left in group 6 Poet's on top of refined ore 7 Clearly superior, Lincoln captures round five 8 Laugh out loud at line in lounge 9 Wine made from corn, hay and crackers 11 Reliable new FDA tests holding answer 15 Excuses fights, lacking leadership 17 Finally refurbish antiquated grip 18 Family members returned pet wrapped in blankets 19 According to me, uncapped rate is steep 25 Pertaining to an area of small chest muscle, first off 26 Millionaires, our celebrities, holding stock 27 Stun for a while, reportedly 28 Returning along banks, a river hiker's provision 29 Joey carries vase and coat of eager traveler 30 Bush berries strewn in places where bushes are grown 32 Author Gardner sounds like a nobleman 33 Cutter's epitaph was reflective 36 Bear cub running around by end of the picnic 38 At hearing, restrain Prague national 40 Street band on a portico 41 Supporter framing Russian leader's family picture 43 Lover ultimately follows me to French sea

Solution