The innovation in religion is relating what is not part of the religion to it, like for example the prayers of Taraweeh, since the supererogatory prayer is not legislated to be offered in congregation. Offering it in such a way is considered as innovation in religion.
A number of narrations explain this verse to refer to the old man/woman who suffer from thirst or similar conditions when fasting, which leads to severe hardship and discomfort, so they are permitted to break their fast and pay the Fidya.
It is natural to have different derivations as people differ in their understanding of a single text, whereas the Mujtahids deal with numerous texts, plus the fact that as time passes further away from the time of the texts, fallacies and probabilities increase. From this, the mission of a Mujtahid becomes harder and his responsibility becomes greater in protecting the religion in a correct way and to the greatest possible extent. The oppressors and the liars throughout the times have made obstacles for us in obtaining the truths from the Imams (peace be upon them) which made the mission of the Mujtahids more difficult. Therefore some variations are to be expected.
<p style="text-align: left;">Kurr water equals in volume to 27 cubic hand-spans. Based on an obligatory precaution, the hand-span is equivalent 25 cm. In terms of mass, Kurr corresponds to 464.1 kg, and it is preferred to consider it to be 470 kg.</p>