Mucous in the stool may be indicative of chronic bowel infection such as shigella, colitis, or proctitis. Make sure that the stool has been comprehensively cultured for bacteria, ova and parasites. Stool tests for fecal leukocytes can also suggest a bowel infection.
Malabsorption can also cause mucous in the stool - tests for fecal fat, lactose intolerance and blood tests for celiac disease should be considered.
"jelly" in the stool is associated with volvulus, intussusception or pseudo-obstruction. Most cases can be found via ct scan and should be asked about when interpreting your films. As I am not a surgeon, I cannot personally comment on these particular diseases.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.