[1] The seat fell vacant following the sudden death of the incumbent Member of the Legislative Assembly (MLA) from United Malays National Organisation (UMNO) of the Barisan Nasional (BN) coalition, Mohd.

[7] The by-election to be conducted under the special guidelines and standard operating procedures (SOPs) imposed by EC due to the New Normal as the country is still observing the recovery phase of Movement Control Order (MCO) for COVID-19 pandemic.

[11] Perak Menteri Besar and BERSATU chief, Ahmad Faizal Azumu has said that Perikatan Nasional (PN) will field a candidate from UMNO to defend the Slim state seat in the by-election.

[17] The yet-to-be registered Pejuang party has also names Syariah lawyer, Amir Khusyairi Mohamad Tanusi, 38, as their candidate with PH endorsement for the Slim poll, who will be contesting as an Independent.

EC chairman Abdul Ghani Salleh had later explained it was a miscommunication as there is no Act that forbids a voter donning shorts from entering a polling centre.