We'd have to know more about your situation, specially what type of visa you had, how long you were in the U.S. prior to 2020 and what type of income you had in the U.S. and U.K.
You would be dual-status if you were a U.S. resident at the time you left and had U.S. source income during your period of non-residency.
Your U.K. income would not be subject to U.S. income tax if it was not effectively connected with a U.S. trade or business. If it were effectively connected, would not qualify for the foreign earned income exclusion unless you are a U.S. citizen or resident alien.
Bank interest is not taxable to a nonresident if it is not effectively connected with a U.S. trade or business.
Dividends are taxable during the nonresident period if they are paid by U.S. companies or paid by a foreign corporation if at least 25% of the corporation's gross income is effectively connected with a U.S. trade or business for the three tax years before the year in which the dividends are declared.
Nonresident Aliens - Source of Income
You would be a part-year California resident unless you are on an overseas employment contract lasting less than 546 days. In such case, California may consider you to be a full year resident.
2020 Guidelines for Determining Resident Status
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