Found this on Google for you
A refrigerator compressor is filled with hydrobenzoline oil... this is a lubricant for the compressor... When you lay the refrigerator down that oil will run up into the refrigerant lines... If you stand it up and plug it in right away, the compressor will pump the oil further into the refrigerant lines... This will cause the compressor to be operating without lubrication... In turn will cause your compressor to possibly burn out... That's why 24 hrs is needed after laying the refrigerator down... But by tilting the refrigerator during moving it, will not cause any oil to leave the compressor... So I would say you are safe to plug it in...