According to this page, Issue 123:
Even though Rick had his right hand amputated by The Governor in #28, he is seen shooting with his right hand in a panel on page 21.
Further cases from this page:
ISSUE 48
Even though Rick had his right hand amputated by The Governor in #28, he is seen with both of his hands when hugging his family in this issue.
ISSUE 49
Even though Rick had his right hand amputated by The Governor in #28, he is seen with both of his hands when he closes the door of the bathroom.
ISSUE 54
Even though Rick had his right hand amputated by The Governor in #28, when walking with Carl in the issue, his left hand is missing instead.
ISSUE 59
Even though Rick had his right hand amputated by The Governor in #28, there is a panel in this issue which shows Rick with both of his hands while holding Carl, after getting out of the car in the middle of the herd attack.
This one I couldn't find, but I suspect that it might be someone confused over this panel, which has both of Carl's arms around Rick's stub:
ISSUE 61
Even though Rick had his right hand amputated by The Governor in #28, he is seen holding the telephone with his right hand in one panel.
ISSUE 69
Even though Rick had his right hand amputated by The Governor in #28, he is seen with both of his hands when he's talking with Abraham about the Alexandria Safe-Zone.
ISSUE 72
Even though Rick had his right hand amputated by The Governor in #28, he is seen holding Carl's shoulder while leaving the house.
ISSUE 97
Even though Rick had his right hand amputated by The Governor in #28, there is a panel in this issue which shows Rick with both of his hands when talking with Andrea.
As well as further evidence from the continuity errors section of Rick's page on the Wikia:
On the Compendium Volume 3, Barnes & Noble Variant cover:
ISSUE 185
When visiting Dwight in a holding cell.