Heart donation and gaining new memory

I thought this was an interesting subject. Just saw this thing on TV about people who received a heart donation and then gained, apparently, some of the personality traits and in one case memories of the donor.
It was kinda creepy, one lady got a heart, and then had a dream about the guy, how he died and his name - and when she rung the donation co-ordinator she was spot on! And he came from a completely different part of the country so she can't have read about it in the paper.
Is it just a psychological reaction or something more? The programme reported that scientists have now found some brain cells in the heart... so?
It was kinda creepy, one lady got a heart, and then had a dream about the guy, how he died and his name - and when she rung the donation co-ordinator she was spot on! And he came from a completely different part of the country so she can't have read about it in the paper.
Is it just a psychological reaction or something more? The programme reported that scientists have now found some brain cells in the heart... so?